論文 - 加来 昌典
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深紫外LED光を用いた有機材料表面の親水化
加来昌典，甲藤正人，植野琴美，牧野由，森本崇，森永高広，森隆博
レーザー学会第591回研究会報告 24 ( 40 ) 23 - 27 2024年11月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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深紫外LED光を用いた有機材料の表面改質
加来昌典，甲藤正人，植野琴美，牧野由，森本崇，森永高広，森隆博
レーザー学会第588回研究会報告 24 ( 21 ) 13 - 17 2024年9月
担当区分：筆頭著者, 責任著者 記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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Initial stage of Si processing using single pulse of NIR fs-laser 査読あり
Masahito Katto, Masanori Kaku, Yuji Sato, Masahiro Tsukamoto, Atushi Yokotani
Proceedings of LPM2023 2023年6月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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真空紫外・極端紫外光を用いた光脱離質量分析装置の開発 査読あり
横谷篤至，亀山晃弘，加来昌典，甲藤正人
レーザ加工学会誌 27 ( 3 ) 131 - 136 2020年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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フェムト秒レーザーによるSi表面の相変化
甲藤正人，横谷篤至，加来昌典，大久保友雅，塚本雅裕
レーザー学会第546回研究会報告「フォトニクス・ワークショップ in 九州」 No. RTM-20 1 - 6 2020年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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真空紫外光照射によって誘起されるPMMA の光脱離過程 査読あり
松本 和也, 小川 祐哉, 渕上 一輝, 加来 昌典
電気学会論文誌Ｃ（電子・情報・システム部門誌） 140 ( 7 ) 862 - 866 2020年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Electronics, Information and Systems
We report on investigation of photon-stimulated desorption processes of polymethylmethacrylate (PMMA) induced by vacuum ultraviolet (VUV) irradiations. Atoms or molecules on PMMA surfaces were to be desorbed and dissociated as a result of absorption of the wavelength-selected VUV photons. Desorbed and dissociated atoms or molecules were then detected by a mass spectrometer which were obtained as a function of the irradiation wavelength. Desorption species with mass number of 28, 29, and 30 were detected at center wavelength of around 160-170 nm, which were identified as CO, CHO, and C2H6, respectively. These photon-stimulated desorption processes of PMMA depend on bond energy or molecular structure.
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フェムト秒レーザーのダブルパルス照射によるシリコン加工の初期過程
甲藤正人、横谷篤至、加来昌典、塚本雅裕
レーザー学会第537回研究会報告「次世代レーザー加工」 RTM-19 29 - 34 2019年11月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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光・レーザーによる洗浄ならびに加工プロセスにおける素過程の観察
甲藤正人, 加来昌典，塚本雅裕，横谷篤至
レーザー学会第529回研究会報告 RTM-18 ( 21-27 ) 1 - 6 2018年11月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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レーザープロセッシングによる高精度光学式センサーの作製法の開発
[2] 亀山晃弘、加来昌典、甲藤正人、横谷篤至
レーザー学会第523回研究会報告 RTM-18 ( 21-27 ) 37 - 42 2018年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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光・レーザー応用による加工ならびに表面分析技術における素過程の考察
甲藤正人，加来昌典，渕上一輝，塚本雅裕，横谷篤至
レーザー学会第516回研究会報告「次世代産業用レーザー」 RTM-17 ( 62-66 ) 7 - 12 2017年12月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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ファイバーブラック回折格子 (FBG) センサーの高性能化
亀山 晃弘，加来 昌典，甲藤 正人，横谷 篤至
レーザー学会第509回研究会報告「レーザー応用」 RTM-17 ( 19-24 ) 23 - 28 2017年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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フェムト秒レーザー同期発振システムによる短波長光発生とレーザープロセス過程の観測
甲藤正人，加来昌典，宮永憲明，塚本雅裕, 横谷篤至
レーザー学会第509回研究会報告「レーザー応用」 RTM-17 ( 19-24 ) 29 - 34 2017年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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Influence of Double Pulse Irradiation on Ablation Area by Femtosecond Laser with Different Delay Time
M. Katto, T. Sugihara, S. Kubodera, M. Tsukamoto, M. Kaku and A. Yokotani
Proceedings of LPM2017 #17-54 2017年6月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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傾斜型ブラッグ回折格子（TFBG）センサーによる液体の屈折率計測 査読あり
亀山晃弘，加来昌典，甲藤正人，横谷篤至
レーザー研究 45 26 - 30 2017年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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傾斜型ブラッグ回折格子（TFBG）センサーによる液体の屈折率計測
亀山 晃弘, 加来 昌典, 甲藤 正人, 横谷 篤至
レーザー研究 45 ( 1 ) 2017年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 レーザー学会
Tilted Fiber Bragg Grating (TFBG) is expected to be used for such sensors as refractometers, twistsensors, liquid level sensors, chemical sensors and biosensors. We review its fabrication techniques andits refractive index measurements and developed a simplified technique to fabricate TFBG forsimultaneous measurements of the refractive index and the temperatures of liquids. We used acombination of a 4ω Nd:YAG laser and a phase mask, which is simpler than a conventional methodusing a 2ω cw Ar+ laser and a Lloyd mirror interferometer. We calculated TFBG's cladding modes bythe multi-layer method and estimated the temperature coefficient of the water's refractive index to beabout ‒1×10‒4 /K using our fabricated TFBG sensor.
DOI： 10.2184/lsj.45.1_26
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Amplification of femtosecond pulses at 126 nm in optical-field-induced plasma filamentation in Ar
Kubodera S., Fujiyoshi K., Kaku M., Katto M.
Proceedings of SPIE - The International Society for Optical Engineering 10254 2017年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
© 2017 SPIE. We have observed an optical gain at the wavelength of 126 nm in an Ar excimer (Ar2 ∗) amplifier by utilizing a femtosecond vacuum ultraviolet (VUV) seed beam tuned at 126 nm. The maximum optical gain value of 1.1 cm -1 with a spatial distribution in the optical-field-induced ionization (OFI) Ar plasma was observed. The plasma diagnosis revealed that the plasma contraction near the plasma amplifier axis together with the plasma expansion was a key issue to observe such a high optical gain value inside the Ar plasma filament. The center axis of the contracted plasma amplifier showed the high electron density more than 10 18 cm -3 even after 100 ns from the plasma production of Ar at 1 MPa. Our OFI plasma/excimer kinetics code reproduced the temporal progress of the optical gain distribution as well as the maximum gain value.
DOI： 10.1117/12.2256014
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真空紫外光領域における光源開発と短波長光の特長を活かした応用技術開発
甲藤正人，加来昌典，佐々木亘，宮永憲明，横谷篤至
レーザー学会第499回研究会報告「次世代産業用レーザー」 RTM-16-51-55 5 - 10 2016年12月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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傾斜型ファイバーブラックグレーティ ング（TFBG）を用いたセンシング技術
亀山晃弘 ，加来昌典 ，甲藤正人 ，横谷篤至
レーザー学会第483回研究会報告 RMT-15-45-50 27 - 32 2016年9月
記述言語：日本語 掲載種別：研究論文（研究会，シンポジウム資料等）
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真空紫外光域における高強度レーザー光源の開発と応用
甲藤正人，加来昌典，横谷篤至，窪寺昌一
レーザー学会第483回研究会報告 RMT-15-45-50 1 - 5 2015年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Amplification of 126 nm femtosecond pulses in optical-field-induced Ar plasma filamentation
Kubodera S., Kaku M., Deshimaru N., Katto M.
2015 IEEE Photonics Conference, IPC 2015 76 - 77 2015年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2015 IEEE Photonics Conference, IPC 2015
© 2015 IEEE. Plasma diagnosis revealed that the electron density of an optical-field-induced Ar 2 ∗ amplifier was larger than 10 18 cm -3 after 100 ns of the plasma production, which resulted in the 126 nm optical gain of 1.1 cm -1 .
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TFBG(傾斜型ブラッグ回折格子)センサーを用いた液体の温度と屈折率の同時計測
亀山晃弘，加来昌典，甲藤正人，窪寺昌一，横谷篤至
レーザー学会第480回研究会報告 RMT-15-31 19 - 24 2015年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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時間遅延をつけたフェムト秒レーザー・ダブルパルスによる加工特性
甲藤正人，杉原隆明，加来昌典，横谷篤至，窪寺昌一
レーザー学会第480回研究会報告 RMT-15-31 31 - 36 2015年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Photon-stimulated desorption surface spectroscopy by VUV emissions from a laser-produced plasma
Kaku M., Kai D., Katto M., Yokotani A., Sasaki W., Kubodera S.
Conference on Lasers and Electro-Optics Europe - Technical Digest 2015-August 2015年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics Europe - Technical Digest
© 2015 OSA. We have developed photon-stimulated desorption surface spectroscopy system using broadband VUV emissions from a laser-produced plasma. Observed desorbed atoms or molecules from material surfaces depended on bond energy or molecular structure.
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Photon-stimulated desorption surface spectroscopy by VUV emissions from a laser-produced plasma
Kaku M., Kai D., Katto M., Yokotani A., Sasaki W., Kubodera S.
Conference on Lasers and Electro-Optics Europe - Technical Digest 2015-August 2015年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics Europe - Technical Digest
© 2015 OSA. We have developed photon-stimulated desorption surface spectroscopy system using broadband VUV emissions from a laser-produced plasma. Observed desorbed atoms or molecules from material surfaces depended on bond energy or molecular structure.
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光電界電離アルゴンエキシマ増幅器を用いた超短パルス真空紫外レーザー 査読あり
加来昌典，甲藤正人，横谷篤至，窪寺昌一
レーザー研究 43 537 - 541 2015年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Surface analysis by photo-stimulated desorption using tunable VUV radiation 査読あり
Kaku M., Kai D., Katto M., Yokotani A., Kubodera S., Sasaki W.
Applied Physics B: Lasers and Optics 119 ( 3 ) 427 - 433 2015年6月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics B: Lasers and Optics
© 2015, Springer-Verlag Berlin Heidelberg. We have demonstrated the photon-stimulated surface spectroscopy using broadband vacuum ultraviolet (VUV) emissions from a laser-produced plasma, in which adsorbed atoms or molecules on material surfaces were to be desorbed and dissociated as a result of absorption of the wavelength-selected VUV photons. Desorbed and dissociated atoms or molecules were then detected by a mass spectrometer. Mass spectra of polyethylene and polyvinyl chloride samples were obtained as a function of the irradiation wavelength. We have found sufficient characteristic differences of the mass spectra in the irradiation wavelength shorter than 200 nm in each sample. The desorption and dissociation of atoms or molecules from material surfaces depended on bond energy or molecular structure.
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Photon-stimulated desorption surface spectroscopy by VUV emissions from a laser-produced plasma
Kaku M., Kai D., Katto M., Yokotani A., Sasaki W., Kubodera S.
CLEO: QELS - Fundamental Science, CLEO_QELS 2015 2015年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：CLEO: QELS - Fundamental Science, CLEO_QELS 2015
We have developed photon-stimulated desorption surface spectroscopy system using broadband VUV emissions from a laser-produced plasma. Observed desorbed atoms or molecules from material surfaces depended on bond energy or molecular structure. © OSA 2015.
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Surface analysis by photo-stimulated desorption using tunable VUV radiation 査読あり
Masanori Kaku, Daichi Kai, Masahito Katto, Atsushi Yokotani, Shoichi Kubodera, and Wataru Sasaki
Applied Physics B 119 ( 3 ) 427 - 433 2015年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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光電界電離アルゴンエキシマ増幅器を用いた 超短パルス真空紫外レーザー
加来 昌典, 甲藤 正人, 横谷 篤至, 窪寺 昌一
レーザー研究 43 ( 8 ) 2015年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 レーザー学会
We have constructed the ultrashort pulse vacuum ultraviolet (VUV) laser system with an optical-fieldinducedionization (OFI) Ar2* amplifier. The amplification properties of the OFI Ar2* amplifier wereevaluated. A gain-length product of 0.84 was obtained by using multi-pass amplification with a VUVcavity. The gain-length product was increased up to 4.3 through the use of single-pass amplificationwith a VUV reflector and a hollow fiber. We optimized temporal and spatial overlaps between a VUVseed pulse generated as the 7th harmonic radiation and the OFI Ar2* amplifier. The optimal injectiontime of the seed pulse into the OFI Ar2* amplifier was 20 ns, which agreed with a peak time of Ar2*spontaneous emission. The spatially-resolved amplification of VUV seed pulses at 126 nm was observedin an OFI Ar2* amplifier. The maximum amplification ratio of 3.1 was observed, which corresponded toa gain value of 1.17 cm-1.
DOI： 10.2184/lsj.43.8_537
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High-intensity VUV laser system with OFI Ar<inf>2</inf> amplifier
Kaku M., Deshimaru N., Katto M., Kubodera S.
2014 IEEE Photonics Conference, IPC 2014 515 - 516 2014年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2014 IEEE Photonics Conference, IPC 2014
© 2014 IEEE. We have constructed the high intensity VUV laser system with an optical-field-induced ionization (OFI) Ar 2 amplifier. The evaluated maximum one-pass gain value of the OFI Ar 2 amplifier was 1.17 cm -1 .
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真空紫外光によって誘起される光脱離現象を利用した表面分析技術
加来昌典，甲斐大智，甲藤正人，横谷篤至，窪寺昌一
レーザー学会第471回研究会報告 RMT-14-30 13 - 16 2014年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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高圧力クリプトン中でのクリプトンダイマー生成
窪寺昌一，甲斐大智，池田凌，鶴添文人，加来昌典
レーザー学会第465回研究会報告 RMT-14-30 13 - 17 2014年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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超短パルス短波長光源の開発とその応用
亀山晃弘，加来昌典，甲藤正人，窪寺昌一，横谷篤至
レーザー学会第465回研究会報告 RMT-14-35 47 - 51 2014年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Development of ultrashort pulsed VUV laser and its applications 査読あり
Masahito Katto, Masanori Kaku, Atsushi Yokotani, Kenzo Miyazaki, Noriaki Miyanaga, Shoichi Kubodera
Journal of Laser Micro/Nanoengineering 9 ( 2 ) 108 - 112 2014年7月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Matsuura Y., Kubodera S.
Electronics and Communications in Japan 97 ( 7 ) 12 - 16 2014年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Electronics and Communications in Japan
SUMMARY We observed that the emission intensity in the extreme and vacuum ultraviolet spectral regions using a laser-produced copper-tungsten alloy plasma was 1.3 times higher than when using a pure tungsten plasma. The enhancement of the emission intensity was explained by the difference of the Rosseland mean opacity of each plasma. © 2014 Wiley Periodicals, Inc.
DOI： 10.1002/ecj.11540
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Development of ultrashort pulsed VUV laser and its applications
Katto M., Kaku M., Yokotani A., Miyazaki K., Miyanaga N., Kubodera S.
Journal of Laser Micro Nanoengineering 9 ( 2 ) 108 - 112 2014年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Journal of Laser Micro Nanoengineering
Vacuum ultraviolet (VUV) laser systems for advanced applications such as micro and precise processing and photochemical reactions have been developed. We have been constructing a VUV-MOPA system to generate output energy of sub-mJ with a pulse width of sub-picosecond at the wavelength of 126 nm. A VUV seed pulse, generated by the 7th harmonics of a 882 nm Ti:Sapphire (TiS) laser was amplified by the Ar2* medium generated from an optical-field-induced ionization of Ar plasma pumped by the TiS laser. We achieved an amplification of 126 nm seed pulse by a factor of 2.6. Recently, we introduced a new 800 nm TiS laser. This laser was synchronized with the 882 nm TiS laser and the delay between these outputs was controllable. We also developed a photo-stimulated desorption spectroscopy method for surface analysis. A tunable incoherent VUV radia-tion obtained from a laser induced plasma was irradiated the samples and then desorbed species were analyzed by mass spectroscopy. This method enables analysis without sample heating and damaging.
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Optical amplification of VUV femtosecond pulses at 126 nm in OFI Ar <inf>2</inf>* amplifier
Kaku M., Daikyuji T., Fujiyoshi K., Katto M., Kubodera S.
2013 IEEE Photonics Conference, IPC 2013 53 - 54 2013年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2013 IEEE Photonics Conference, IPC 2013
We have observed the spatially-resolved optical amplification of femtosecond VUV pulses at 126 nm using an OFI Ar 2 * amplifier. The maximum amplification ratio of 2.57 was observed, which corresponded to the optical gain of 0.94 cm -1 . © 2013 IEEE.
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Daido H., Suzuki Y., Kawachi T., Fukuda T., Nakagiri T., Kaku M., Kubodera S.
Optics Express 21 ( 23 ) 28182 - 28188 2013年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Express
We describe the direct measurement of actual transmittance of sodium samples with thickness of a 2 mm and 3 mm in a spectral range > 115 nm, resulting in > 50% transmittance of 3 mm thick solid and liquid sodium samples including transmission of a pair of the windows at the wavelength of 120 nm, giving an extinction coefficient of ~10 -6 to ~10 -7 which represents the sodium with a few cm thickness to be partially transparent for this wavelength. To confirm the measurement, we perform simple imaging experiments by the ultra-violet light passing through a 8 mm-thick sodium sample to illuminate a mesh as an object, resulting in obtaining a clear image. © 2013 Optical Society of America.
DOI： 10.1364/OE.21.028182
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Demonstration of partially transparent thick metallic sodium in the vacuum ultraviolet spectral range 査読あり
Hiroyuki Daido, Yoji Suzuki, Tetsuya Kawachi, Takeshi Fukuda, Toshio Nakagiri, Masanori Kaku, and Shoichi Kubodera
Optics Express 110 ( 3 ) 397 - 400 2013年11月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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アルゴンエキシマ増幅器を用いた真空紫外フェムト秒パルスの増幅
加来昌典，大休寺匠，甲藤正人，宮永憲明，窪寺昌一
レーザー学会第449回研究会報告 RMT-13 ( 45 ) 29 - 32 2013年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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深紫外～極端紫外光源を活用した分析・計測技術の開発
亀山晃弘，加来昌典，甲藤正人，窪寺昌一，横谷篤至
レーザー学会第449回研究会報告 RMT-13 23 - 28 2013年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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アルゴンエキシマ増幅器を用いた真空紫外フェムト秒パルスの増幅
加来 昌典, 大休寺 匠, 甲藤 正人, 宮永 憲明, 窪寺 昌一
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 449 29 - 32 2013年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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亀山 晃弘, 加来 昌典, 甲藤 正人, 窪寺 昌一, 横谷 篤至
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 449 23 - 28 2013年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Transmission imaging of sodium in the vacuum ultra-violet spectral range: new application for an intense VUV source 査読あり
Hiroyuki Daido, Yoji Suzuki, Tetsuya Kawachi, Takeshi Fukuda, Toshio Nakagiri, Masanori Kaku, Shoichi Kubodera, Alexander S. Pirozhkov
Proceedings of SPIE 8849 884908-1 - 884908-11 2013年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Amplification of ultrashort pulse vacuum ultraviolet coherent radiation in OFI Ar 2 * amplifier
Kaku M., Ezaki Y., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 8677 2013年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have observed the optical amplification of femtosecond VUV seed pulses at 126 nm by using an optical-fieldinduced ionization (OFI) Ar 2 * amplifier. The maximum amplification ratio of 2.57 was observed. This corresponded to the maximum one-pass gain value of 0.94, which was consistent with that observed in previous experiments. We measured the spatial distribution of the gain region in the OFI Ar plasma by probing the 126 nm VUV seed pulses. The gain region of 220 μm (FWHM) was evaluated after 20 ns of the plasma production, which indicated the average plasma expansion temperature of 1.2 eV. An Ar + density contour measured by using laser interferometry showed consistency with the spatial distribution of the plasma gain region. © 2013 SPIE.
DOI： 10.1117/12.2014879
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Enhancement of extreme ultraviolet radiations from a laser-produced plasma using copper-tungsten alloy 査読あり
Yuta Matsuura, Masanori Kaku, and Shoichi Kubodera
Applied Physics B Vol. 110 ( No. 3 ) 397 - 400 2013年3月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Matsuura Y., Kaku M., Kubodera S.
Applied Physics B: Lasers and Optics 110 ( 3 ) 397 - 400 2013年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics B: Lasers and Optics
Continuous extreme ultraviolet (EUV) emission intensity from a laser-produced plasma in the wavelength between 40 and 200 nm for a copper-tungsten alloy target was observed to be 1.3 times higher than that for a tungsten target. Using the alloy target, low-opacity regions of one material were filled with high-opacity regions of another material. This opacity effect resulted in the increase of a calculated Rosseland mean opacity compared with either of the constituents, which may explain the increase of the EUV emission intensity. © 2013 Springer-Verlag Berlin Heidelberg.
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Amplification of ultrashort pulse vacuum ultraviolet coherent radiation in OFI Ar2* amplifier 査読あり
Masanori Kaku, Yoshihiro Ezaki, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 8677 867712-1 - 867712-4 2013年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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超短パルス真空紫外レーザー
窪寺昌一，加来昌典，大休寺匠，藤吉一行，江崎功浩，甲藤正人，宮崎健創
電気学会研究会資料 光・量子デバイス研究会 OQD-13-008 21 - 23 2013年1月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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窪寺 昌一, 加来 昌典, 大休寺 匠, 藤吉 一行, 江崎 功浩, 甲藤 正人, 宮崎 健創
電気学会研究会資料. OQD, 光・量子デバイス研究会 2013 ( 1 ) 21 - 23 2013年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Daido H., Suzuki Y., Kawachi T., Fukuda T., Nakagiri T., Kaku M., Kubodera S., Pirozhkov A.
Proceedings of SPIE - The International Society for Optical Engineering 8849 2013年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
Metallic sodium (Na) was proposed as a transparent material in the vacuum ultra-violet (VUV) spectral range in 1930s and in 1960s. However no clear transmission has ever been demonstrated. In this paper we describe firstly the direct measurement of actual transmittance of a sodium samples in a spectral range longer than 115 nm which corresponds to the shortest transmission wavelength of magnesium fluoride (MgF 2 ) windows, resulting in several tens of % transmittance of a 3 mm-thick solid sodium sample including MgF 2 windows at the wavelength of ∼120 nm. We also find very weak temperature dependency of the transmittance up to 150 degrees centigrade where the solid sample is melted at 97 degrees. The measured transmittance pushes us to make a simple imaging experiment illuminated by the VUV light through a 2-mm thick sodium sample, resulting in obtaining a clear image composed of 100 μm diameter tungsten mesh recorded on a two dimensional Charge Coupled Device detector. The result also opens a way to construct an optical imaging device for objects inside or through a solid or a liquid sodium medium. According to the present experiment, we can make a continuous real time transmission imaging for a liquid sodium sample if we use proper optical setup including an intense continuous VUV source or high repetition rated intense coherent source for holographic data acquisition. Such an experiment opens up a way to perform transmission imaging through or inside a sodium medium for characterization of hydrodynamic and material properties. © 2013 SPIE.
DOI： 10.1117/12.2022938
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大道 博行, 鈴木 庸氏, 河内 哲哉, 福田 武司, 中桐 俊男, 加来 昌典, 窪寺 昌一
日本原子力学会 年会・大会予稿集 2013 ( 0 ) 2013年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：一般社団法人 日本原子力学会
ナトリウムの光学的特性は２０世紀前半から調べられてきた。１９３０年代にWoodにより紫外線域に透過の可能性があることが指摘された。１９６０年代には米国オークリッジ国立研究所で精力的な研究が行われたが、厚さ１ミクロン以下のコーティングしたナトリウムの透過率を調べたのみで透過率の詳細は明らかになっていない。近年大阪大学の福田らによりその重要性が指摘され、それに基づいて筆者らの研究グループではより厚いサンプルを用いた固体ナトリムの真空紫外域の透過スペクトル特性の詳細を調べた。その結果と期待される応用等について講演する。
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超短パルス真空紫外レーザーの開発
加来昌典，江崎功浩，大休寺匠，藤吉一行，甲藤正人，窪寺昌一，宮崎健創，宮永憲明
レーザー学会第436回研究会報告 RTM-12-56 1 - 5 2012年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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加来 昌典, 江崎 功浩, 大休寺 匠, 藤吉 一行, 甲藤 正人, 窪寺 昌一, 宮崎 健創, 宮永 憲明
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 436 1 - 5 2012年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高輝度真空紫外光源の開発と極端紫外光極微細分析技術への展開
甲藤正人，亀山晃弘，加来昌典，窪寺昌一，横谷篤至
レーザー学会第431回研究報告 RMT-12-35 17 - 21 2012年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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甲藤 正人, 亀山 晃弘, 加来 昌典, 窪寺 昌一, 横谷 篤至
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 431 17 - 21 2012年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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金ターゲットを用いたレーザー生成プラズマからの極端紫外域における発光強度の増加 査読あり
加来昌典，松浦悠太，窪寺昌一
電気学会論文誌C（電子・情報・システム部門誌） Vol. 132 ( No. 8 ) 1283 - 1286 2012年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Quasi-point incoherent ArF* excimer emission source at 193 nm using a laser-produced plasma 査読あり
Masanori Kaku, Yusuke Sato, and Shoichi Kubodera
Applied Physics B Vol. 107 ( No. 1 ) 85 - 89 2012年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Quasi-point incoherent ArF*excimer emission source at 193 nm using a laser-produced plasma
Kaku M., Sato Y., Kubodera S.
Applied Physics B: Lasers and Optics 107 ( 1 ) 85 - 89 2012年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics B: Lasers and Optics
We have demonstrated proof-of-principle of an incoherent ArF* emission source with a quasi-point emission geometry using a laser-produced plasma in an Ar/F 2 /He/Ne mixed gas. The VUV emission characteristics, such as the emission size, were dependent on those of the plasma-initiating laser. The average emission power was 10 μW at a repetition rate of 10 Hz at 193 nm. The average power conversion efficiency of the 193-nm emission from the plasma-initiating Nd:YAG laser was 6.3×10 -6 . The average emission power at 193 nm was proportional to that of the plasma-initiating laser, indicating the scaling of the emission source. © 2012 Springer-Verlag.
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レーザー生成プラズマ光源を用いたナトリウムの真空紫外域における吸収分光測定
加来 昌典, 東 啓太, 柳田 大志, 窪寺 昌一
電気学会研究会資料. OQD, 光・量子デバイス研究会 2012 ( 12 ) 17 - 21 2012年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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レーザー生成プラズマ光源を用いたナトリウムの真空紫外域における吸収分光測定
加来昌典，東啓太，柳田大志，窪寺昌一
電気学会研究会資料 光・量子デバイス研究会 ODQ-12-017 17 - 21 2012年3月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Quasi-point incoherent ArF* excimer emission source at 193 nm using a laser-produced plasma 査読あり
Masanori Kaku, Yusuke Sato, and Shoichi Kubodera
Applied Physics B 107 85 - 89 2012年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Matsuura Y., Kubodera S.
IEEJ Transactions on Electronics, Information and Systems 132 ( 8 ) 1283 - 1286 2012年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IEEJ Transactions on Electronics, Information and Systems
We observed that the emission intensity in extreme and vacuum ultraviolet spectral regions using a laser-produced copper tungsten alloy plasma was 1.3 times higher than that using a pure tungsten plasma. The enhancement of the emission intensity was explained by the difference of the Rosseland mean opacity of each plasma. © 2012 The Institute of Electrical Engineers of Japan.
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佐々木 亘, 瀧川 靖雄, 加来 昌典, 甲藤 正人, 窪寺 昌一, 横谷 篤至, 宮林 延良
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 420 31 - 35 2011年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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加来 昌典, 松浦 悠太, 甲藤 正人, 横谷 篤至, 窪寺 昌一, 佐々木 亘, 宮林 延良
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 420 25 - 29 2011年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Novel method of pulsed laser deposition using liquid flow target
Katto M., Kaku M., Kubodera S., Yakotani A.
30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011 1000 - 1004 2011年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：30th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2011
We proposed a novel scheme for film deposition based on the pulsed laser deposition. We supply the liquid flow as target in and pulsed laser was irradiated it. Ablated species from the liquid-target was deposited on the substrate. In this method we can always obtain the constant target status and we can keep film quality as good for long time. First, we demonstrate to fabricate SnO x film using SnO 2 colloidal solution. We are now trying to fabricate a hydroxyapatite films suing a colloidal hydroxyapatite solution.
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Mo-Siミラーの光洗浄と光脱離分析評価
佐々木亘，瀧川靖雄，加来昌典，甲藤正人，窪寺昌一，横谷篤至，宮林延良
レーザー学会第420回研究会報告 RMT-11 31 - 35 2011年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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レーザー生成プラズマ極端紫外光源の開発と表面分析への応用
加来昌典，松浦悠太，甲藤正人，横谷篤至，窪寺昌一，佐々木亘，宮林延良
レーザー学会第420回研究会報告 RMT-11 25 - 29 2011年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Vacuum ultraviolet Ar 2* laser at 126 nm pumped by an infrared high-intensity laser
Kaku M., Katto M., Kubodera S.
2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf. 1550 - 1552 2011年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2011 Int. Quantum Electron. Conf., IQEC 2011 and Conf. Lasers and Electro-Optics, CLEO Pacific Rim 2011 Incorporating the Australasian Conf. Optics, Lasers and Spectroscopy and the Australian Conf.
We have observed similar small signal gain coefficients of 0.84 and 0.86 cm -1 in two different experiments, where Ar 2 * was produced in free space filled with Ar and inside an Ar-filled hollow fiber, respectively. © 2011 IEEE.
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Vacuum ultraviolet Ar2* laser at 126 nm pumped by an infrared high-intensity laser
Kaku M., Katto M., Kubodera S.
Optics InfoBase Conference Papers 1550 - 1552 2011年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We have observed similar small signal gain coefficients of 0.84 and 0.86 cm-1 in two different experiments, where Ar 2 * was produced in free space filled with Ar and inside an Ar-filled hollow fiber, respectively. © 2011 AOS.
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Vacuum ultraviolet Ar2* laser at 126 nm pumped by an infrared high-intensity laser 査読あり
Masanori Kaku, Masahito Katto, and Shoichi Kubodera
Proceedings of IQEC/CLEO Pacific Rim 2011 C460 2011年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Amplification properties of vacuum ultraviolet Ar2 produced by infrared high-intensity laser
Kaku M., Harano S., Matsumoto R., Katto M., Kubodera S.
Optics Letters 36 ( 14 ) 2719 - 2721 2011年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Letters
We report optical amplification of Ar* 2 at 126nm, pumped by optical-field-induced ionization (OFI) created by an infrared high-intensity laser. A gain-length product of 0.84 was obtained by using multipass amplification with a vacuum ultraviolet (VUV) cavity. The gain-length product was increased up to 4.3 through the use of single-pass amplification with a VUV reflector and a hollow 5:0 cm-long fiber. Similar small signal gain coefficients of 0.84 and 0:86cm?1 were obtained in two different experiments, in which OFI Ar plasma gain media were produced in free space filled with Ar and inside an Ar-filled hollow fiber. © 2011 Optical Society of America.
DOI： 10.1364/OL.36.002719
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Amplification properties of vacuum ultraviolet Ar2* produced by an infrared high-intensity laser 査読あり
Masanori Kaku, Shinya Harano, Ryota Matsumoto, Masahito Katto, and Shoichi Kubodera
Optics Letters 36 ( 14 ) 2719 - 2721 2011年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Autocorrelation of femtosecond VUV pulses using multiphoton ionization
Kaku M., Nagaya W., Zushi H., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 7915 2011年3月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have developed an autocorrelator utilizing multiphoton ionization of rare gases as a nonlinear medium to evaluate the pulse width of a femtosecond Ti:Sapphire laser at 882 nm. The autocorrelation width of 171 fs (FWHM) was evaluated by the autocorrelator utilizing nine-photon ionization of Ar. By using the ninth-order correlation factor of 1.06, the actual pulse width of 161 fs (FWHM) was determined, which was consistent to that of 165 fs (FWHM) measured with a two-photon autocorrelator. The autocorrelation measurement utilizing the multiphoton ionization of Ar should be applied to vacuum ultraviolet (VUV) ultrashort pulses at 126 nm, since neutral Ar atoms will be ionized by two-photon absorption. This method has a potential to become a versatile autocorrelator that characterizes femtosecond laser pulse widths in the wide spectral range between IR and VUV. © 2011 SPIE.
DOI： 10.1117/12.872099
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Autocorrelation of femtosecond VUV pulses using multiphoton ionization 査読あり
Masanori Kaku, Wataru Nagaya, Hironari Zushi, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 7915 79150G-1 - 7 2011年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Surface analysis system by VUV photons-stimulated desorption
Katto M., Yokotani A., Kaku M., Kubodera S., Miyabayashi N., Sasaki W.
29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings 103 1439 - 1443 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：29th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2010 - Congress Proceedings
We developed a novel surface analysis system using a vacuum ultraviolet (VUV) photons. When the VUV photons were irradiated on the material surface, surface desorption was stimulated. The desorbed species were analyzed by the mass analyzer. First, we studied the decomposition process excited by VUV excimer lamps. We found that the different photon energy resulted in the different time dependence of the fragment detection even if the contamination had similar chemical construction. It suggested that the tracing the decomposition process We developed an analyzing system, called "photo-stimulated desorption mass spectrometer (PSD)". A broadband VUV radiation for surface desorption was obtained from the Ar plasma excited by a Q-SW Nd:YAG laser. We selected and scanned wavelength by a monochromator. The desorbed species were analyzed by the quadrupole mass analyzer. We scanned the VUV wavelength and obtained the mass data. This PSD system enables us to analyze without damage on the sample.
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加来 昌典, 甲藤 正人, 横谷 篤至, 窪寺 昌一, 佐々木 亘, 宮林 延良
電気学会研究会資料. OQD, 光・量子デバイス研究会 2010 ( 46 ) 39 - 43 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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極端紫外光源を用いた光脱離質量分析装置の開発
加来昌典，甲藤正人，横谷篤至，窪寺昌一，佐々木亘，宮林延良
電気学会研究会資料 光・量子デバイス研究会 OQD-10-54 39 - 43 2010年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Novel analysis system using surface desorption stimulated by VUV photons from laser-produced plasma
Katto M., Kaku M., Kubodera S., Yokotani A., Miyabayashi N., Sasaki W.
Proceedings of SPIE - The International Society for Optical Engineering 7751 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We proposed and developed a novel surface analysis system using vacuum ultraviolet (VUV) photons. When the VUV photons were irradiated on the material surface, surface desorption was stimulated. The desorbed species were analyzed by the mass spectrometer. First, we studied the decomposition process induced by VUV photons from excimer lamps. We found that the different photon energy resulted in the different time dependence of the fragments signals even if the materials had similar chemical construction. It suggested that the identification of the materials should be possible by tracing the decomposition process. We developed an analyzing system, called "Photo-Stimulated Desorption (PSD) mass spectrometer" using a broadband VUV radiation from the Ar plasma excited by a Q-switched Nd:YAG laser. The desorbed species were analyzed by the quadrupole mass spectrometer. This PSD system was useful surface analysis tool not only for the semiconductor but also plastics, which is easily affected by heat. © 2010 Copyright SPIE - The International Society for Optical Engineering.
DOI： 10.1117/12.880303
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Vacuum ultraviolet argon excimer laser at 126 nm excited by a high intensity laser
Kaku M., Harano S., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 7751 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have observed the optical amplification of the Ar 2 * excimer at 126 nm pumped by optical-field-induced ionization (OFI) caused by an infrared high-intensity laser. We have evaluated similar small signal gain coefficients of approximately 1.0 cm -1 in two different experiments, where OFI Ar plasmas as gain media were produced in free space filled with Ar and inside an Ar-filled hollow fiber. This indicates that the function of a hollow fiber was to guide the infrared excitation laser and VUV Ar 2 * emissions, and not to regulate the OFI plasma. Despite the gain coefficient value at 126 nm, the laser oscillation has not been observed. This was limited by the optical quality of available state-of-the-art vacuum ultraviolet optics. © 2010 Copyright SPIE - The International Society for Optical Engineering.
DOI： 10.1117/12.880749
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OFI argon excimer amplifier for intense femtosecond pulse generation in the vacuum ultraviolet
Kubodera S., Harano S., Matsumoto R., Kaku M., Katto M.
2010 23rd Annual Meeting of the IEEE Photonics Society, PHOTINICS 2010 274 - 275 2010年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2010 23rd Annual Meeting of the IEEE Photonics Society, PHOTINICS 2010
We have developed an optical-field-induced ionization vacuum ultraviolet Ar 2 * excimer amplifier at 126 nm to amplify femtosecond VUV seed pulses that are generated by wavelength conversion of femtosecond infrared laser pulses. ©2010 IEEE.
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Development of ultra-short pulse VUV laser system for nanoscale processing
Katto M., Zushi H., Nagaya W., Harano S., Matsumoto R., Yokotani A., Kaku M., Kubodera S., Miyanaga N.
Applied Physics A: Materials Science and Processing 101 ( 2 ) 297 - 301 2010年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics A: Materials Science and Processing
We have developed intense vacuum ultraviolet (VUV) radiation sources for advanced material processing, such as photochemical surface reactions and precise processing on a nanometer scale. We have constructed a new VUV laser system to generate sub-picosecond pulses at the wavelength of 126 nm. A seed VUV pulse was generated in Xe as the 7th harmonic of a 882-nm Ti:sapphire laser. The optimum conversion was achieved at the pressure of 1.2 Torr. The seed pulse will be amplified by the Ar 2 * media generated by an optical-field-induced ionization Ar plasma produced by the Ti:sapphire laser. We have obtained a gain coefficient of g=0.16 cm -1 . Our developing system will provide VUV ultra-short pulses with sub-μJ energy at a repetition rate of 1 kHz. © 2010 Springer-Verlag.
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甲藤 正人, 加来 昌典, 窪寺 昌一, 横谷 篤至, 宮林 延良, 佐々木 亘
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 404 27 - 32 2010年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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真空紫外光による光励起表面脱離プロセスと表面分析への応用
甲藤正人，加来昌典，窪寺昌一，横谷篤至，宮林延良，佐々木亘
レーザー学会第404回研究会報告 RTM-10-32 27 - 32 2010年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Separation technique of raisins and stems utilizing characteristics of polarization 査読あり
Takashi Kurosawa, Akira Hosotani, Tadashi Ohmiya, Minoru Horikoshi, Masao Kanazawa, Masahito Katto Masanori Kaku, and Shoichi Kubodera
Japanese Journal of Applied Physics 49 ( 9 ) 098001-1 - 2 2010年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Separation technique for raisins and stems utilizing characteristics of polarization
Kurosawa T., Hosotani A., Ohmiya T., Horikoshi M., Kanazawa M., Katto M., Kaku M., Kubodera S.
Japanese Journal of Applied Physics 49 ( 9 PART 1 ) 98001 - 098001-2 2010年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Japanese Journal of Applied Physics
We have improved the accuracy of the laser separation of stems from raisin samples on the basis of the degree of polarization of scattered light from raisins and stems. The specular reflection from wet raisins was minimized by regulating the degree of polarization of their scattered emissions. Wet and dry raisins were therefore judged as the same samples. Using these polarization characteristics, wet or dry raisins were separated from their stems in our laser inspection system. The detection error was reduced from 25 to 7% in our system. © 2010 The Japan Society of Applied Physics.
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Vacuum ultraviolet argon excimer laser at 126 nm excited by a high intensity laser 査読あり
Masanori Kaku, Shinya Harano, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 7751 775113-1 - 6 2010年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Novel analysis system using surface desorption stimulated by VUV photons from laser-produced plasma 査読あり
Masahito Katto, Masanori Kaku, Shoichi Kubodera, Atsusi Yokotani, Nobuyoshi Miyabayashi, and Wataru Sasaki
Proceedings of SPIE 7751 77511D-1 - 7 2010年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Development of ultra-short pulse VUV laser system for nanoscale processing 査読あり
Masahito Katto, Hironari Zushi, Wataru Nagaya, Shinya Harano, Ryota Matsumoto, Atushi Yokotani, Masanori Kaku, Shoichi Kubodera and Noriaki Miyanaga
Applied Physics A 101 297 - 301 2010年6月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 7581 2010年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We report the optical amplification characteristics of an optical-field-induced-ionization (OFI) Ar 2 * excimer vacuum ultraviolet (VUV) amplifier at 126 nm by using two experimental approaches. We have observed the amplification of OFI Ar 2 * excimer emission and evaluated the gain length product of 1.0 by using an optical cavity. We also achieved the gain length product of 5.0 by measuring the one pass amplification inside a hollow fiber with the length of 5 cm. The use of a hollow fiber was effective to guide the VUV emission and to extend a gain length. A small signal gain coefficient of 1.0 cm -1 was evaluated in both experimental approaches. © 2010 Copyright SPIE - The International Society for Optical Engineering.
DOI： 10.1117/12.840573
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Katto M., Oda K., Kaku M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Optics Communications 283 ( 3 ) 414 - 416 2010年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Communications
Subpicosecond vacuum ultraviolet (VUV) pulses at the wavelength of 126 nm have been generated in rare gases as a result of the 7th harmonic radiation of a subpicosecond Ti:Sapphire laser oscillating at 882 nm. The VUV harmonic intensity was optimized in Xe at the pressure of 1.2 Torr. The behavior of the harmonic emission was qualitatively reproduced by the classical nonlinear optics. The increase of the harmonic intensity was limited by multiphoton ionization of Xe. © 2009 Elsevier B.V. All rights reserved.
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Generation of subpicosecond vacuum ultraviolet pulses at 126 nm by using harmonics of a subpicosecond Ti:Sapphire laser 査読あり
Masahito Katto, Kazuyoshi Oda, Masanori Kaku, Atsushi Yokotani, Shoichi Kubodera, Noriaki Miyanaga, and Kunioki Mima
Optics Communications 283 ( 3 ) 414 - 416 2010年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Optical-field-induced-ionization Ar2* excimer amplifier for intense femtosecond vacuum ultraviolet pulse generation 査読あり
Masanori Kaku, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 7581 75810A-1 - 8 2010年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Femtosecond vacuum ultraviolet seed pulse generation at 126 nm by using harmonic radiation
Kubodera S., Kaku M., Nagaya W., Zushi H., Harano S., Matsumoto R., Katto M.
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 116 - 117 2009年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
We report femtosecond seed pulse generation at 126 nm using the 7th harmonic radiation from a Ti:Sapphire laser at 882 nm. The 7th harmonic emission was optimized in a low pressure Xe as a nonlinear medium. © 2009 IEEE.
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レーザー生成プラズマ極端紫外光源を用いた光脱離質量分析装置の開発
加来 昌典, 甲藤 正人, 横谷 篤至, 窪寺 昌一, 佐々木 亘, 宮林 延良
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 394 1 - 6 2009年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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レーザー生成プラズマ極端紫外光源を用いた光脱離質量分析装置の開発
加来昌典，甲藤正人，横谷篤至，窪寺昌一，佐々木亘，宮林延良
レーザー学会第394回研究会報告 RTM-09-38 1 - 6 2009年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Generation and amplification of ultra-short-pulsed vacuum ultraviolet radiation
Katto M., Yokotani A., Kaku M., Kubodera S., Miyanaga N.
ICALEO 2009 - 28th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings 102 874 - 879 2009年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ICALEO 2009 - 28th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings
We have been developing an ultra-short-pulsed vacuum ultraviolet (VUV) laser system for advanced applications such as micro and precise processing and photochemical reactions. We propose and construct a new VUV laser system to generate output energy of sub-mJ with a pulse width of sub-picosecond at the wavelength of 126 nm. A VUV seed pulse was generated in Xe gas at the pressure of 1.2 Torr with high conversion efficiency as the 7th harmonics of a 882 nm Ti:Sapphire laser. The Ar* 2 amplification medium was generated in an optical-field-induced ionized Ar plasma pumped by another 800 nm Ti:Sapphire laser with an amplification factor of 400. VUV output at 1 μJ in the sub-picosecond pulse will be obtained at a repetition rate of 1 kHz, leading to an average power of 1 mW at 126 nm. It will be useful VUV coherent source for applications of precise and micro laser processing.
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レーザーによるレーズンとステムの新しい選別技術 査読あり
黒澤崇，細谷章，大宮正，堀越稔，金澤正夫，加来昌典，甲藤正人，窪寺昌一
レーザー加工学会誌 16 ( 4 ) 9861 - 9863 2009年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Femtosecond vacuum ultraviolet seed pulse generation at 126 nm by using harmonic radiation 査読あり
Shoichi Kubodera, Masanori Kaku, Wataru Nagaya, Hironari Zushi, Shinya Harano, Ryota Matsumoto, and Masahito Katto
2009 IEEE LEOS Annual Meeting Conference Proceedings 116 - 117 2009年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Wasamoto M., Katto M., Kaku M., Kubodera S., Yokotani A.
Applied Surface Science 255 ( 24 ) 9861 - 9863 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Surface Science
We have observed the photo-chemical reaction process of organic molecules in gas phase induced by vacuum ultraviolet (VUV) radiation. We chose hydrocarbons that contain five carbons in a molecule as samples. To observe the wavelength dependence, three kinds of excimer lamps (Ar 2 *-126 nm, Kr 2 *-147 nm and Xe 2 *-172 nm) were used as light sources of the VUV radiation. Vaporized organic molecular compounds were irradiated by the VUV at a pressure of 12 Pa and detected by means of mass spectrometry. Change of the mass spectra with the irradiation period was measured. As a result, we found that different reaction rates were observed for the different compounds. In particular, 1-pentene and cyclopentane, which have the same molecular weight, have very different decomposition speeds for the irradiation of 172-nm radiation. The facts observed in this work are considered to be very promising for developing a technique to distinguish the targeted compound from others that have similar structures. © 2009 Elsevier B.V. All rights reserved.
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原野 慎也, 松本 亮大, 甲藤 正人, 加来 昌典, 窪寺 昌一
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 391 1 - 5 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Harmonics generation in VUV spectral region driven by a NIR Ti: Sapphire laser in rare gases
Katto M., Oda K., Kaku M., Kubodera S., Yokotani A., Miyanaga N., Mima K.
Proceedings of SPIE - The International Society for Optical Engineering 7131 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
In vacuum ultraviolet (VUV) spectral region, coherent light sources are being thus in high demand for advanced precise and microscopic processing. A sub-picosecond VUV light source at 126 nm has been produced by the nonlinear wavelength up-conversion of a near infrared femtosecond Ti:Sapphire laser at 882 nm in rare gases. We obtained the maximum output of the 7 th harmonic at 126 nm in Xe at the pressure of around 2 Torr. The 126 nm beam will be amplified by an optical-field-ionization produced Ar 2 * medium and then high-power sub-picosecond VUV pulses will be obtained. © 2009 SPIE.
DOI： 10.1117/12.817004
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EUV and debris characteristics of a laser-plasma tin-dioxide colloidal target
Kubodera S., Kakua M., Tougea S., Kattob M.
Proceedings of SPIE - The International Society for Optical Engineering 7131 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
Characteristics of extreme ultraviolet (EUV) and debris emissions as well as debris reduction have been investigated for a laser-produced plasma (LPP) EUV source by using a colloidal/liquid jet target containing tin dioxide nanoparticles and tin chloride. The amount of deposited debris on a silicon witness plate was determined by a total laser energy irradiated onto a target. Double-pulse laser irradiation was effective for improving the EUV conversion efficiency as a result of plasma regulation. It was, however, not effective for reducing the deposited debris from a colloidal target with nanoparticles. In situ low-temperature heating of the witness plate was effective to reduce the amount of deposited debris. Room-temperature photon processing using an incoherent vacuum ultraviolet excimer lamp at 126 nm deoxidized a deposited tin oxide layer. In addition to these active debris reduction methods, the use of a tin chloride liquid target at a certain concentration passively reduced the amount of deposited debris as a result of production of chlorine atoms that sputtered and/or etched deposition. The EUV CE of more than 1% was observed from a tin chloride target by using double-pulse laser irradiation. ©2009 SPIE.
DOI： 10.1117/12.816882
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OFI argon excimer amplifier for intense subpicosecond VUV pulse generation
Kakua M., Kuboderaa S., Odaa K., Kattob M., Yokotanib A., Miyanagac N., Mimac K.
Proceedings of SPIE - The International Society for Optical Engineering 7131 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have demonstrated an OFI Ar2* excimer VUV amplifier at 126 nm pumped by a high-intensity laser in the table top size. We observed the Ar2* excimer emission centered at 126 nm with the spectral bandwidth of 10 nm (FWHM), which was produced in the OFI plasma. Significant amplification was observed inside the OFI Ar2* excimer as a result of the optical feedback provided by a VUV reflector. The gain-length product of 5.6 was observed at the Ar pressure of 11 atm. The population inversion density on the order of 1017 cm-3 was evaluated inside the OFI plasma, which would be sufficient for the amplification of a subpicosecond VUV pulse at 126 nm produced by the harmonic generation. © 2009 SPIE.
DOI： 10.1117/12.820060
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加来 昌典, 原野 慎也, 松本 亮大, 長谷 渉, 圖師 裕也, 甲藤 正人, 窪寺 昌一
電気学会研究会資料. OQD, 光・量子デバイス研究会 2009 ( 59 ) 1 - 6 2009年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Mass spectrometric study of photo dissociation of organic molecules by vacuum-ultraviolet irradiation for development of analysis technique 査読あり
Makoto Wasamoto, Masahito Katto, Masanori Kaku, Shoichi Kubodera, Atsusi Yokotani
Applied Surface Science 255 9861 - 9863 2009年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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高強度レーザー励起真空紫外アルゴンエキシマレーザー
原野慎也，松本亮大，甲藤正人，加来昌典，窪寺昌一
レーザー学会第391回研究会報告 RMT-09-24 1 - 5 2009年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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超短パルスコヒーレント光発生
加来昌典，原野慎也，松本亮大，長谷渉，圖師裕也，甲藤正人，窪寺昌一
電気学会研究会資料 光・量子デバイス研究会 OQD-09-59 1 - 6 2009年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Debris characteristics and mitigation of a laser plasma tin-contained liquid jet/droplet targets
Kaku M., Touge S., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 7271 2009年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We realized a laser-plasma EUV target, which satisfied the high EUV CE and the debris suppression simultaneously by using low-concentration liquid jet/droplet targets containing tin oxides and chlorides. Plasma regulation by double pulse irradiation improved the EUV CE. In terms of the debris emissions, we reduced the amount of the deposited tin oxide by applying in situ heat and high-energy photons onto a witness plate. These active debris suppression resulted in the decrease of the deposition rate and deoxidation of the debris, respectively. The use of tin chloride liquid target also realized a well-balanced debris behavior, where deposited debris was cleaned by chlorine atoms or ions, resulting in an approximately zero deposition rate. ©2009 SPIE.
DOI： 10.1117/12.813479
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OFI rare-gas excimer amplifier for high-intensity VUV pulse generation
Katto M., Kaku M., Oda K., Kamikihara T., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Proceedings of SPIE - The International Society for Optical Engineering 7196 2009年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have demonstrated an argon excimer vacuum ultraviolet (VUV) amplifier at 126 nm by using the optical-field induced ionization (OFI) of argon. The gain-length product of 5.6 was achieved as a result of the optical feedback inside the amplifier with a VUV mirror. Plasma self-channeling caused by the high-intensity pump laser was simultaneously observed when the maximum gain-length product was observed. We have also optimized the output power of a subpicosecond VUV seed beam at 126 nm produced in low-pressure rare-gases as a result of the seventh harmonic nonlinear wavelength conversion of a Ti:Sapphire laser at 882 nm. © 2009 SPIE.
DOI： 10.1117/12.807339
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OFI argon excimer amplifier for intense subpicosecond VUV pulse generation 査読あり
Masanori Kaku, Shoichi Kubodera, Kazuyoshi Oda, Masahito Katto, Atsushi Yokotani, Noriaki Miyanaga and Kunioki Mima
Proceedings of SPIE 7131 71311C 2009年4月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Harmonics generation in VUV spectral region driven by a NIR Ti:sapphire laser in rare gases 査読あり
Masahito Katto, Kazuyoshi Oda, Masanori Kaku, Shoichi Kubodera, Atsushi Yokotani, Noriaki Miyanaga and Kunioki Mima
Proceedings of SPIE 7131 2009年4月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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EUV and debris characteristics of a laser-plasma tin-dioxide colloidal target 査読あり
Shoichi Kubodera, Masanori Kaku, Shunsuke Touge, and Masahito Katto
Proceedings of SPIE 7131 71311O 2009年4月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Debris characteristics and mitigation of a laser plasma tin-contained liquid jet/droplet targets 査読あり
Masanori Kaku, Shunsuke Touge, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 7271 727132 2009年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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OFI rare-gas excimer amplifier for high-intensity VUV pulse generation 査読あり
Masahito Katto, Masanori Kaku, Kazuyoshi Oda, Tadashi Kamikihara, Atsushi Yokotani, and Shoichi Kubodera
Proceedings of SPIE 7196 71960L1 2009年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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長谷 渉, 圖師 裕也, 加来 昌典, 甲藤 正人, 窪寺 昌一
電気関係学会九州支部連合大会講演論文集 2009 ( 0 ) 172 - 172 2009年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：電気・情報関係学会九州支部連合大会委員会
We have generated vacuum ultraviolet (VUV) pulses at 126 nm by nonlinear wavelength conversion of a subpicosecond Ti:Sapphire laser pulse at 882nm. We have been measuring autocorrelation of the VUV coherent emission by multiphoton ionization of rare gases. Two divided VUV beams in a Michelson interferometer were overlapped to produce multiphoton ionization in a rare gas, which led to autocorrelation of subpicosecond VUV pulses.
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甲藤 正人, 小田 一義, 上木原 忠, 和佐本 真, 高野 智也, 亀山 晃弘, 加来 昌典, 窪寺 昌一, 横谷 篤至, 宮永 憲明, 三間 國興
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 381 5 - 10 2008年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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紫外・真空紫外光源の開発と光プロセスへの応用
甲藤正人，小田一義，上木原忠，和佐本真，高野智也，亀山晃弘，加来昌典，窪寺昌一，横谷篤至，宮永憲明，三間國興
レーザー学会第381回研究会報告 RTM-08-43 5 - 10 2008年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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EUV and debris characteristics of a laser-plasma tin dioxide nano-particle colloidal jet target
Kaku M., Suetake S., Senba Y., Katto M., Kubodera S.
Proceedings of SPIE - The International Society for Optical Engineering 6921 2008年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
Debris characteristics and its reduction have been investigated for a laser-produced plasma (LPP) extreme ultraviolet (EUV) source using a colloidal jet target containing tin dioxide nano-particles. Dominant deposited debris on a witness plate was found to have a form of oxidized tin (SnO x ) originated from nano-particles. Quantitative debris amounts were determined by total laser energy irradiated onto a target, not by laser irradiation modes, such as single or double pulse irradiation. In-situ low-temperature (100 °C) heating of a plate was effective to reduce the deposited debris amount, since colloidal debris was easily vaporized by the heat. Another approach to remove the deposited debris was roomtemperature photon processing using incoherent vacuum ultraviolet (VUV) emission at 126 nm. X-ray photoelectron spectroscopy (XPS) analysis has shown that the deposited SnOx debris layer was deoxidized by the 126 nm VUV photon energy.
DOI： 10.1117/12.771542
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Optical amplification of the OFI rare-gas excimers in the vacuum ultraviolet
Kaku M., Harano S., Touge S., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 832 - 833 2008年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
We report the optical amplification in a compact OFI rare-gas excimer VUV amplifier and the generation of femtosecond VUV seed pulses using the harmonic conversion of an infrared Ti:Sapphire laser. ©2008 IEEE.
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Nano-particles of hydroxyapatite formed by underwater laser ablation method
Katto M., Kuroe Y., Kaku M., Kubodera S., Yokotani A., Katayama H., Nakayama T.
ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings 65 - 67 2008年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ICALEO 2008 - 27th International Congress on Applications of Lasers and Electro-Optics, Congress Proceedings
Hydroxyapatite (HAp) is a biocompatibility material. We have successfully obtained the nano-particles of hydroxyapatite by the underwater laser ablation. A sintered HAp ceramics target was made of commercially available HAp powder and it was placed in the purified water. The focused KrF excimer laser outputs were irradiated on the target surface at the fluence from 7 J/cm 2 to 23 J/cm 2 at the repetition rate of 100 Hz. We found that the amount of the particles increased in proportional to the laser fluence. However, the rate of content of sub-micron particles was became larger at the lower laser fluence. The particles made by 7J/cm 2 laser ablation were dispersing in the water for 12 hours after stopping the laser irradiation.
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酸化錫ナノ粒子コロイドターゲットを用いる極端紫外レーザープラズマ光源のデブリ特性
加来 昌典, 窪寺 昌一
レーザー研究 36 ( 11 ) 726 - 730 2008年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：The Laser Society of Japan
ebris characteristics and theireduction have been investigated for a laser-produced plasma extreme ultraviolet source by using a colloidal jet/droplet target containing tin dioxide nanoparticles. The amount of deposited debris on a silicon witness plate was determined by totalaser energy irradiated onto the target. Double laser pulse irradiation was not effective for deposited debris reduction. Incontrast, <I>in situ</I> low-temperature heating of the witness plate was effective inreducing the amount of deposited debris. Room-temperature photon processing using an incoherent vacuum ultraviolet excimer lamp at 126 nm deoxidized a deposited tin oxide layer
DOI： 10.2184/lsj.36.726
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酸化錫ナノ粒子コロイドターゲットを用いる極端紫外レーザープラズマ光源のデブリ特性 査読あり
加来昌典，窪寺昌一
レーザー研究 36 ( 11 ) 726 - 730 2008年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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Optical amplification of the OFI rare-gas excimers in the vacuum ultraviolet 査読あり
Masanori Kaku, Shinya Harano, Shunsuke Touge, Masahito Katto, Atsushi Yokotani, Shoichi Kubodera, Noriaki Miyanaga, and Kunioki Mima
2008 IEEE LEOS Annual Meeting Conference Proceedings 2008年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Kaku M., Suetake S., Senba Y., Katto M., Kubodera S.
Applied Physics B: Lasers and Optics 93 ( 2-3 ) 361 - 364 2008年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics B: Lasers and Optics
We have demonstrated auto-cleaning of deposited tin debris produced in a laser-plasma extreme ultraviolet (EUV) source by using a liquid jet target containing tin chloride solution. The use of double laser pulse irradiation improved the EUV conversion efficiency of 1.1%, which was 3.3 times as large as that obtained with single laser pulse irradiation. At an appropriate concentration of tin chloride, the amount of deposited debris was balanced out with that of sputtered and/or etched debris, resulting in a thickness of deposited debris less than 1 nm after 40∈000 laser pulse irradiations. © 2008 Springer-Verlag.
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Auto-cleaning of deposited tin debris in a laser-produced plasma extreme ultraviolet source by using a liquid jet target containing tin chloride 査読あり
Masanori Kaku, Sumihiro Suetake, Yusuke Senba, Masahito Katto, and Shoichi Kubodera
Applied Physics B Laser and Optics 93 361 - 364 2008年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Nano-particles of hydroxyapatite formed by underwater laser ablation method 査読あり
Masahito Katto, Yasuhiro Kuroer, Masanori Kaku, Shoichi Kubodera, Atushi Yokotani, Hiroaki Katayama, Takeyoshi Nakayama
Congress Proceedings of 27th ICALEO M203 2008年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of TW-class 2-cycle pulses using a pressure-gradient hollow fiber
Bohman S., Suda A., Kaku M., Kanai T., Yamaguchi S., Midorikawa K.
2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS 2008年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS
We demonstrate generation of intense 5 fs pulses using a pressure gradient hollow fiber. The beam after pulse compression could be focused to a diffraction-limited spot with an intensity of 3×10 W/cm 2 . ©2008 Optical Society of America.
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OFI rare-gas excimer amplifier for intense sub-picosecond VUV pulse generation
Kaku M., Taniguchi Y., Oda K., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series 2008年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series
We report the Ar* 2 ampTification with a gain-length product of 6 pumped by a high- intensity laser and the generation of subpicosecond seed pulses at 126 nm using harmonic radiation of an infrared Ti:Sapphire laser. © 2008 Optical Society of America.
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OFI rare-gas excimer amplifier for intense sub-picosecond VUV pulse generation
Kaku M., Taniguchi Y., Oda K., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS 2008年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：2008 Conference on Quantum Electronics and Laser Science Conference on Lasers and Electro-Optics, CLEO/QELS
We report the Ar* 2 amplification with a gain-length product of 6 pumped by a high- intensity laser and the generation of subpicosecond seed pulses at 126 nm using harmonic radiation of an infrared Ti: Sapphire laser. © 2008 Optical Society of America.
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Generation of TW-class 2-cycle pulses using a pressure-gradient hollow fiber
Bohman S., Suda A., Kaku M., Kanai T., Yamaguchi S., Midorikawala K.
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series 2008年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series
We demonstrate generation of intense 5 fs pulses using a pressure gradient hollow fiber. The beam after pulse compression could be focused to a diffraction-limited spot with an intensity of 3×10 18 W/cm 2 . © 2008 Optical Society of America.
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Development of intense vacuum ultraviolet laser system for precise and microscopic processing 査読あり
Masahito Katto, Atsushi Yokotani, Masanori Kaku, Kazuyoshi Oda, Shoichi Kubodera, Noriaki Miyanaga, and Kunioki Mima
Proceedings of LPM 2008 8 - 16 2008年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of 5 fs, 0.5 TW pulses focusable to relativistic intensities at 1 kHz
Bohman S., Suda A., Kaku M., Nurhuda M., Kanal T., Yamaguchi S., Midorikawa K.
Optics Express 16 ( 14 ) 10684 - 10689 2008年7月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Express
We have demonstrated the generation of 5 fs, 0.5 TW pulses at 1 kHz repetition rate using a pulse compression technique in a hollow fiber with a pressure gradient. Owing to the excellent beam quality by passing through the hollow fiber, the beam after pulse compression could be focused to a nearly diffraction-limited spot size. We obtained for the first time a peak intensity as high as 5×10 18 W/cm 2 in the 2-cycle regime. ©2008 Optical Society of America.
DOI： 10.1364/OE.16.010684
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Generation of 5 fs, 0.5 TW pulses focusable to relativistic intensities at 1 kHz 査読あり
Samuel Bohman, Akira Suda, Masanori Kaku, Muhammad Nurhuda, Takuya Kanai, Shigeru Yamaguchi, and Katsumi Midorikawa
Optics Express 16 16684 - 16689 2008年7月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Suetake S., Senba Y., Kubodera S., Katto M., Higashiguchi T.
Applied Physics Letters 92 ( 18 ) 2008年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics Letters
Debris characteristics and their reduction have been investigated for a laser-produced plasma extreme ultraviolet source by using a colloidal jet target containing tin dioxide nanoparticles. The amounts of deposited debris on a witness plate were determined by total laser energy irradiated onto a target. In situ low-temperature (100 °C) heating of a plate was effective to reduce the amounts of deposited debris, since colloidal debris was easily vaporized by the heat. © 2008 American Institute of Physics.
DOI： 10.1063/1.2924302
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Deposited debris characteristics and its reduction of a laser-produced plasma extreme ultraviolet source using a colloidal tin dioxide jet target 査読あり
Masanori Kaku, Sumihiro Suetake, Yusuke Senba, Shoichi Kubodera, Masahito Katto, and Takeshi Higashiguchi
Applied Physics Letters 92 181503-1 - 181503-3 2008年5月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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OFI rare-gas excimer amplifier for intense sub-picosecond VUV pulse generation 査読あり
Masanori Kaku, Yuta Taniguchi, Kazuyoshi Oda, Masahito Katto, Atsushi Yokotani, Shoichi Kubodera, Noriaki Miyanaga, and Kunioki Mima
CLEO/QELS & PhAST 2008 Technical Digest JThC3 2008年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of TW-class 2-cycle pulses using a pressure-gradient hollow fiber 査読あり
Samuel Bohman, Akira Suda, Masanori Kaku, Takuya Kanai, Shigeru Yamaguchi, and Katsumi Midorikawa
CLEO/QELS & PhAST 2008 Technical Digest JFH2 2008年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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High-intensity subpicosecond vacuum ultraviolet laser system
Kubodera S., Kaku M., Taniguchi Y., Katto M., Yokotani A., Miyanaga N., Mima K.
Proceedings of SPIE - The International Society for Optical Engineering 6874 2008年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have been developing an ultrashort-pulse high-intensity vacuum ultraviolet (VUV) laser. Ultrashort VUV pulses at 126 nm have been produced in rare-gases by nonlinear wavelength conversion of an infrared Ti:sapphire laser at 882 nm. This pulse will be amplified inside an Ar 2 * amplifier excited by optical-field-induced ionization electrons. The amplification characteristics of the Ar 2 * amplifier has been improved by plasma channeling induced by a high-intensity plasma-initiating laser.
DOI： 10.1117/12.760351
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EUV and debris characteristics of a laser-plasma tin-dioxide nano-particle colloidal jet target 査読あり
Masanori Kaku, Sumihiro Suetake, Yusuke Senba, Masahito Katto, and Shoichi Kubodera
Proceedings of SPIE 6921 69212Y1 - 69212Y8 2008年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Kanai T., Suda A., Bohman S., Kaku M., Yamaguchi S., Midorikawa K.
Applied Physics Letters 92 ( 6 ) 2008年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics Letters
We have developed a beam stabilization system for high-power femtosecond lasers operating at a repetition rate of 1 kHz. The beam pointing at a hollow fiber input was stabilized to within 1 μm rms and the fluctuations of the broadened spectra and power were significantly improved. This technique enables us to increase the input power to a hollow fiber for intense few-cycle pulse generation. © 2008 American Institute of Physics.
DOI： 10.1063/1.2842414
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Pointing stabilization of a high-repetition rate high-power femtosecond laser for intense few-cycle pulse generation 査読あり
Takuya Kanai, Akira Suda, Samuel Bohman, Masanori Kaku, Shigeru Yamaguchi, and Katsumi Midorikawa
Applied Physics Letters 92 061106-1 - 061106-3 2008年2月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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High-intensity subpicosecond vacuum ultraviolet laser system 査読あり
Shoichi Kubodera, Masanori Kaku, Yuta Taniguchi, Masahito Katto, Atsushi Yokotani, Noriaki Miyanaga, and Kunioki Mima
Proceedings of SPIE 6874 68740L1 - 68740L8 2008年2月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of TW-class 2-cycle pulses using a pressure-gradient hollow fiber
Bohman S., Suda A., Kaku M., Kanai T., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We demonstrate generation of intense 5 fs pulses using a pressure gradient hollow fiber. The beam after pulse compression could be focused to a diffraction-limited spot with an intensity of 3×10 18 W/cm 2 . © 2008 Optical Society of America.
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OFI rare-gas excimer amplifier for intense sub-picosecond VUV pulse generation
Kaku M., Taniguchi Y., Oda K., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Optics InfoBase Conference Papers 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We report the Ar 2 * amplification with a gain-length product of 6 pumped by a high- intensity laser and the generation of subpicosecond seed pulses at 126 nm using harmonic radiation of an infrared Ti:Sapphire laser. © 2008 Optical Society of America.
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OFI rare-gas excimer amplifier for intense sub-picosecond VUV pulse generation
Kaku M., Taniguchi Y., Oda K., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Optics InfoBase Conference Papers 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We report the Ar 2 amplification with a gain-length product of 6 pumped by a high- intensity laser and the generation of subpicosecond seed pulses at 126 nm using harmonic radiation of an infrared Ti:Sapphire laser. © 2008 Optical Society of America.
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Generation of TW-class 2-cycle pulses using a pressure-gradient hollow fiber
Bohman S., Suda A., Kaku M., Kanai T., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2008年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We demonstrate generation of intense 5 fs pulses using a pressure gradient hollow fiber. The beam after pulse compression could be focused to a diffraction-limited spot with an intensity of 3×10 18 W/cm 2 . © 2008 Optical Society of America.
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窪寺 昌一, 加来 昌典
電気学会研究会資料. OQD, 光・量子デバイス研究会 2007 ( 60 ) 31 - 35 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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甲藤 正人, 小田 一義, 谷口 雄太, 加来 昌典, 横谷 篤至, 窪寺 昌一, 宮永 憲明, 三間 國興
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 368 13 - 18 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高強度真空紫外エキシマレーザー
窪寺昌一，加来昌典
電気学会光・量子デバイス研究会資料 OQD-07-64 31 - 35 2007年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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高輝度真空紫外コヒーレント光源の開発 査読あり
甲藤正人，小田一義，谷口雄太，加来昌典，横谷篤至，窪寺昌一，宮永憲明，三間國興
レーザー学会第368回研究会報告 13 - 18 2007年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Kaku M., Suetake S., Senba Y., Sato Y., Katto M., Kubodera S.
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest
Characteristics of emitted particles from a laser-produced tin plasma using a colloidal tin dioxide nano-particle jet target were investigated. By using double laser pulses, the EUV conversion efficiency at 13.5 nm and the ion energy were simultaneously regulated. Deposited amount of tin oxide was not well controlled, however.
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Optical amplification of vacuum ultraviolet argon excimer produced by a high-intensity laser
Kaku M., Taniguchi Y., Hosotani A., Katto M., Yokotani A., Kubodera S., Miyanaga N., Mima K.
Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS 370 - 371 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference Proceedings - Lasers and Electro-Optics Society Annual Meeting-LEOS
We report the Ar 2 amplification with a gain-length product of 6 pumped by a high-intensity laser and the generation of subpicosecond seed pulses at 126 nm using harmonic radiation of an infrared Ti: Sapphire laser. ©2007 IEEE.
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OFI vacuum ultraviolet rare-gas excimer amplifier for subpicosecond VUV pulse amplification
Kaku M., Taniguchi Y., Hosotani A., Katto M., Yokotani A., Miyanaga N., Mima K., Kubodera S.
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest
We evaluated amplification characteristics of the nanosecond vacuum ultraviolet argon excimer emission at 126 nm, whose kinetics was initiated by high-intensity femtosecond laser-produced electrons. Subpicosecond 126 nm emissions were produced simultaneously as a result of the nonlinear wavelength conversion, which will be amplified in the amplifier.
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Generation of intense vacuum ultraviolet radiations for advanced materials processing
Katto M., Yokotani A., Kubodera S., Kaku M., Hosotani A., Miyanaga N., Mima K.
26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
We have been developing high intensity vacuum ultraviolet (VUV) laser system for advanced applications such as micro and precise processing and photochemical reactions. We propose and construct a new VUV laser system to generate an output energy of sub mJ with a pulse width of subpicosecond at the wavelength of 126nm. A seed pulse was generated in Xe as the 7th harmonics of a 882 nm Ti:sapphire laser, and the Ar 2 * amplifier media were generated in an optical-field-induced ionization Ar plasma produced by another 785 nm Ti:sapphire laser. The VUV radiation should be further amplified in a discharge-pumped Ar 2 * amplifier, which is under construction.
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Kaku M., Katto M., Kubodera S.
26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
We investigated the effective technique for debris suppression of a laser-produced tin plasma using a colloidal tin dioxide jet target, as well as the EUV emission and debris characteristics of the target. By using double pulse laser irradiation with an optimum delay of 100 ns, the EUV conversion efficiency of 1.2% at 13.5 nm was observed. The peak energy and intensity of ionic debris were simultaneously reduced by the double laser pulse irradiation. The peak kinetic energy of the singly-ionized tin ion was reduced from 9 to 3 keV, when an expanding low-density preplasma was produced. The dominant debris from a laser-produced tin plasma, which was deposited on a witness plate, was found to be oxidized tin (SnO x ). By heating a witness plate at 100 °C, the deposited debris amount decreased to approximately one third.
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Generation of extreme ultraviolet continuum radiation driven by sub-10-fs two-color field
Kaku M., Oishi Y., Suda A., Kannari F., Midorikawa K.
Springer Series in Optical Sciences 132 413 - 419 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer Series in Optical Sciences
We observed extreme ultraviolet (XUV) continuum radiation generated by using a sub-10-fs two-color pulse. When a laser field consisting of fundamental and its second harmonic pulses with parallel polarization was applied to high-order harmonic generation in argon, a continuum spectrum centered at 30 nm was obtained with an energy as high as 10 nJ. The broadband radiation indicates the possibility of generating powerful single attosecond pulses in the XUV region. © 2007 Springer-Verlag New York.
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Bohman S., Kaku M., Suda A., Yamaguchi S., Midorikawa K.
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series
We propose and demonstrate a pulse compression technique using a symmetric pressure-gradient hollow fiber. This technique improves the spatial and spectral qualities of multi-mJ femtosecond laser pulses spectrally-broadened by self-phase modulation. ©2007 Optical Society of America.
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Bohman S., Kaku M., Suda A., Yamaguchi S., Midorikawa K.
Conference on Lasers and Electro-Optics, 2007, CLEO 2007 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics, 2007, CLEO 2007
We propose and demonstrate a pulse compression technique using a symmetric pressure-gradient hollow fiber. This technique improves the spatial and spectral qualities of multi-mJ femtosecond laser pulses spectrally-broadened by self-phase modulation. © 2007 Optical Society of America.
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Kaku M., Suda A., Bohman S., Yamaguchi S., Midorikawa K.
Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Quantum Electronics and Laser Science (QELS) - Technical Digest Series
We report the single-shot observation of quasi-continuum high-harmonic spectrum with a harmonic energy of 10 nJ in the XUV region by using a two-color laser field. It indicates a possibility of generating single attosecond pulses. ©2006 Optical Society of America.
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Kaku M., Suda A., Bohman S., Yamaguchi S., Midorikawa K.
Conference on Lasers and Electro-Optics, 2007, CLEO 2007 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics, 2007, CLEO 2007
We report the single-shot observation of quasi-continuum high-harmonic spectrum with a harmonic energy of 10 nJ in the XUV region by using a two-color laser field. It indicates a possibility of generating single attosecond pulses. © 2006 Optical Society of America.
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Pointing stabilization of high-power femtosecond laser for few-cycle pulse generation
Kanai T., Suda A., Bohman S., Kaku M., Yamaguchi S., Midorikawa K.
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2007年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest
We have developed a beam stabilization system for a high-power femtosecond laser operating at a repetition rate of 1 kHz. The beam position at a hollow fiber input was stabilized to within ±1 μm rms and the output fluctuation was significantly improved.
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Optimization of hollow fiber pulse compression using pressure gradients
Nurhuda M., Suda A., Kaku M., Midorikawa K.
Applied Physics B: Lasers and Optics 89 ( 2-3 ) 209 - 215 2007年11月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics B: Lasers and Optics
We present a study on the optimization of multi-mJ spectral broadening in neon-filled hollow fibers using pressure gradients. It is found that the intensity of the laser pulse at the entrance of the hollow fiber should be below or at the level where multi-photon ionization (MPI) starts to occur. If the intensity is higher than the threshold value for MPI, ionization can significantly reduce the throughput efficiency. The extension of the scheme to a terawatt power level is also addressed. © 2007 Springer-Verlag.
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Higashiguchi T., Kaku M., Katto M., Kubodera S.
Applied Physics Letters 91 ( 15 ) 2007年10月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics Letters
We have demonstrated suppression of suprathermal ions from a colloidal microjet target plasma containing tin-dioxide (Sn O2) nanoparticles irradiated by double laser pulses. We observed a significant decrease of the tin and oxygen ion signals in the charged-state-separated energy spectra when double laser pulses were irradiated. The peak energy of the singly ionized tin ions decreased from 9 to 3 keV when a preplasma was produced. The decrease in the ion energy, considered as debris suppression, is attributed to the interaction between an expanding low-density preplasma and a main laser pulse. © 2007 American Institute of Physics.
DOI： 10.1063/1.2799175
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Suppression of suprathermal ions from a colloidal microjet target containing SnO2 nanoparticles by using double laser pulses 査読あり
Takeshi Higashiguchi, Masanori Kaku, Masahito Katto, and Shoichi Kubodera
Applied Physics Letters 91 151503-1 - 151503-3 2007年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Optimization of hollow fiber pulse compression using pressure gradients 査読あり
Muhammad. Nurhuda, Akira Suda, Masanori Kaku, Katsumi Midorikawa
Applied Physics B 89 209 - 215 2007年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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EUV and debris characteristics of a Laser-produced tin Plasma using a colloidal tin dioxide jet target 査読あり
Masanori Kaku, Masahito Katto, and Shoichi Kubodera
Congress Proceedings of ICALEO 2007 325 - 331 2007年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Optical amplification of vacuum ultraviolet argon excimer produced by a high-intensity laser 査読あり
Masanori Kaku, Yuta Taniguchi, Akira Hosotani, Masahito Katto, Atsushi Yokotani, Shoichi Kubodera, Noriaki Miyanaga, and Kunioki Mima
2007 IEEE LEOS Annual Meeting Conference Proceedings 370 - 371 2007年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of intense vacuum ultraviolet radiations for advanced materials processing 査読あり
Masahito Katto, Atsushi Yokotani, Shoichi Kubodera, Masanori Kaku, Akira Hosotani, Noriaki Miyanaga, Kunioki MIma
Congress Proceedings of ICALEO 2007 332 - 335 2007年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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加来 昌典, 谷口 雄太, 細谷 章, 甲藤 正人, 横谷 篤至, 窪寺 昌一, 宮永 憲明, 三間 圀興
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 365 37 - 41 2007年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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高強度真空紫外アルゴンエキシマレーザーの開発
加来昌典，谷口雄太，細谷章，甲藤正人，横谷篤至，窪寺昌一，宮永憲明，三間圀興
レーザー学会第365回研究会報告 RMT-07-34 37 - 42 2007年9月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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甲藤 正人, 横谷 篤至, 窪寺 昌一, 加来 昌典, 塚本 雅裕, 阿部 信行, 片山 貴博, 中山 斌義, 藤田 雅之
レーザー学会研究会報告 = Reports on the Topical meeting of the Laser Society of Japan 364 7 - 11 2007年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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PLD法による多結晶ハイドロキシアパタイト被膜の室温成長
甲藤正人，横谷篤至，窪寺昌一，加来昌典，塚本雅裕，阿部信行，片山貴博，中山斌義，藤田雅之
レーザー学会第364回研究会報告 RMT-07-23 7 - 11 2007年8月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Pointing stabilization of high-power femtosecond laser for few-cycle pulse generation 査読あり
Takuya Kanai, Akira Suda, Samuel Bohman, Masanori Kaku, Shigeru Yamaguchi, and Katsumi Midorikawa
Proceedings of CLEO/Pacific Rim 2007 419 - 420 2007年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Debris characteristics of a laser-produced plasma extreme ultraviolet emission source using a colloidal tin dioxide nano-particle jet target 査読あり
Masanori Kaku, Sumihiro Suetake, Yusuke Senba, Yusuke Sato, Masahito Katto, and Shoichi Kubodera
Proceedings of CLEO/Pacific Rim 2007 545 - 546 2007年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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OFI vacuum ultraviolet rare-gas excimer amplifier for subpicosecond VUV pulse amplification 査読あり
Masanori Kaku, Yuta Taniguchi, Akira Hosotani, Masahito Katto, Atsushi Yokotani, Noriaki Miyanaga, Kunioki Mima, and Shoichi Kubodera
Proceedings of CLEO/Pacific Rim 2007 543 - 544 2007年8月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Single-shot observation of quasi-continuum high-harmonic generation in a two-color driving field 査読あり
Masanori Kaku, Akira Suda, Samuel Bohman, Shigeru Yamaguchi, and Katsumi Midorikawa
CLEO/QELS & PhAST 2007 Technical Digest JThB3 2007年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Spectral Broadening of femtosecond laser pulses using a hollow fiber with symmetric pressure gradient 査読あり
Samuel Bohman, Masanori Kaku, Akira Suda, Shigeru Yamaguchi, and Katsumi Midorikawa
CLEO/QELS & PhAST 2007 Technical Digest JThD138 2007年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Fundamental properties of high-order harmonic generation from field-free aligned molecules with intense femtosecond laser pulses 査読あり
Kenzo Miyazaki, Godai Miyaji, Masanori Kaku, and Kazumichi Yoshii
Chinese Optics Letters 5 S139 - S142 2007年3月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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極端紫外域における広帯域連続スペクトル光の発生
加来昌典，須田亮，ボーマンサムエル，金井拓也，山口滋，緑川克美
エクストリームフォトニクス研究 平成18年度成果報告書 44 2007年3月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Kaku M., Katto M., Kubodera S.
26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
We investigated the effective technique for debris suppression of a laser-produced tin plasma using a colloidal tin dioxide jet target, as well as the EUV emission and debris characteristics of the target. By using double pulse laser irradiation with an optimum delay of 100 ns, the EUV conversion efficiency of 1.2% at 13.5 nm was observed. The peak energy and intensity of ionic debris were simultaneously reduced by the double laser pulse irradiation. The peak kinetic energy of the singly-ionized tin ion was reduced from 9 to 3 keV, when an expanding low-density preplasma was produced. The dominant debris from a laser-produced tin plasma, which was deposited on a witness plate, was found to be oxidized tin (SnO ). By heating a witness plate at 100 °C, the deposited debris amount decreased to approximately one third. x
DOI： 10.2351/1.5061119
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Generation of intense vacuum ultraviolet radiations for advanced materials processing
Katto M., Yokotani A., Kubodera S., Kaku M., Hosotani A., Miyanaga N., Mima K.
26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：26th International Congress on Applications of Lasers and Electro-Optics, ICALEO 2007 - Congress Proceedings
We have been developing high intensity vacuum ultraviolet (VUV) laser system for advanced applications such as micro and precise processing and photochemical reactions. We propose and construct a new VUV laser system to generate an output energy of sub mJ with a pulse width of subpicosecond at the wavelength of 126nm. A seed pulse was generated in Xe as the 7th harmonics of a 882 nm Ti:sapphire laser, and the Ar * amplifier media were generated in an optical-field-induced ionization Ar plasma produced by another 785 nm Ti:sapphire laser. The VUV radiation should be further amplified in a discharge-pumped Ar * amplifier, which is under construction. 2 2
DOI： 10.2351/1.5061120
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Kaku M., Suetake S., Senba Y., Sato Y., Katto M., Kubodera S.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
Characteristics of emitted particles from a laser-produced tin plasma using a colloidal tin dioxide nano-particle jet target were investigated. By using double laser pulses, the EUV conversion efficiency at 13.5 nm and the ion energy were simultaneously regulated. Deposited amount of tin oxide was not well controlled, however. © CLEO Pacific Rim 2007.
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OFI vacuum ultraviolet rare-gas excimer amplifier for subpicosecond VUV pulse amplification
Kaku M., Taniguchi Y., Hosotani A., Katto M., Yokotani A., Miyanaga N., Mima K., Kubodera S.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We evaluated amplification characteristics of the nanosecond vacuum ultraviolet argon excimer emission at 126 nm, whose kinetics was initiated by high-intensity femtosecond laser-produced electrons. Subpicosecond 126 nm emissions were produced simultaneously as a result of the nonlinear wavelength conversion, which will be amplified in the amplifier. © CLEO Pacific Rim 2007.
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Pointing stabilization of high-power femtosecond laser for few-cycle pulse generation
Kanai T., Suda A., Bohman S., Kaku M., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We have developed a beam stabilization system for a high-power femtosecond laser operating at a repetition rate of 1 kHz. The beam position at a hollow fiber input was stabilized to within ± 1 um rms and the output fluctuation was significantly improved. © CLEO Pacific Rim 2007.
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佐藤 勇介, 谷口 雄太, 末原 憲一郎, 上木原 忠, 加来 昌典, 窪寺 昌一
電気関係学会九州支部連合大会講演論文集 2007 ( 0 ) 141 - 141 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：電気・情報関係学会九州支部連合大会委員会
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末竹 純裕, 仙波 佑介, 加来 昌典, 窪寺 昌一
電気関係学会九州支部連合大会講演論文集 2007 ( 0 ) 142 - 142 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：電気・情報関係学会九州支部連合大会委員会
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Bohman S., Kaku M., Suda A., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We propose and demonstrate a pulse compression technique using a symmetric pressure-gradient hollow fiber. This technique improves the spatial and spectral qualities of multi-mJ femtosecond laser pulses spectrally-broadened by self-phase modulation. © 2007 Optical Society of America.
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Bohman S., Kaku M., Suda A., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We propose and demonstrate a pulse compression technique using a symmetric pressure-gradient hollow fiber. This technique improves the spatial and spectral qualities of multi-mJ femtosecond laser pulses spectrally-broadened by self-phase modulation. © 2007 Optical Society of America.
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Bohman S., Kaku M., Suda A., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We propose and demonstrate a pulse compression technique using a symmetric pressure-gradient hollow fiber. This technique improves the spatial and spectral qualities of multi-mJ femtosecond laser pulses spectrally-broadened by self-phase modulation. © 2007 Optical Society of America.
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Kaku M., Suda A., Bohman S., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We report the single-shot observation of quasi-continuum high-harmonic spectrum with a harmonic energy of 10 nJ in the XUV region by using a two-color laser field. It indicates a possibility of generating single attosecond pulses. © 2006 Optical Society of America.
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Kaku M., Suda A., Bohman S., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We report the single-shot observation of quasi-continuum high-harmonic spectrum with a harmonic energy of 10 nJ in the XUV region by using a two-color laser field. It indicates a possibility of generating single attosecond pulses. © 2006 Optical Society of America.
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Kaku M., Suda A., Bohman S., Yamaguchi S., Midorikawa K.
Optics InfoBase Conference Papers 2007年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
We report the single-shot observation of quasi-continuum high-harmonic spectrum with a harmonic energy of 10 nJ in the XUV region by using a two-color laser field. It indicates a possibility of generating single attosecond pulses. © 2006 Optical Society of America.
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Continuum high-order harmonic radiation in extreme ultraviolet region by sub-10-fs two-color field
Kaku M., Oishi Y., Suda A., Kannari F., Midorikawa K.
Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006 2006年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ. © 2006 Optical Society of America.
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2カラーパルスで得られる広帯域高次高調波のスペクトル観測
加来昌典，須田亮，サムエルボーマン，山口滋，緑川克美
第4回エクストリームフォトニクス研究会 52 - 53 2006年11月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Continuum harmonic radiation in the extreme ultraviolet region using synthesized sub-10-fs two-color field 査読あり
Masanori Kaku, Yu Oishi, Akira Suda, Fumihiko Kannari, and Katsumi Midorikawa
Springer Series in Chemical Physics 88 Ultrafast Phenomena XV 88 24 - 26 2006年10月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Generation of extreme ultraviolet continuum radiation driven by a sub-10-fs two-color field 査読あり
Yu Oishi, Masanori Kaku, Akira Suda, Fumihiko Kannari, and Katsumi Midorikawa
Optics Express 14 7230 - 7237 2006年8月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Continuum High-Order Harmonic Radiation in Extreme Ultraviolet Region by sub-10-fs Two-Color Field 査読あり
Masanori Kaku, Yu Oishi, Akira Suda, Fumihiko Kannari, and Katsumi Midorikawa
CLEO/QELS & PhAST 2006 Technical Digest JThD4 2006年5月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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サブ10fs，2カラーパルスによる広帯域高次高調波発生
加来昌典，大石裕，須田亮，神成文彦，緑川克美
第3回理研・分子研合同シンポジウム エクストリームフォトニクス研究 93 - 94 2006年4月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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サブ10fs，2カラーパルスによる広帯域高次高調波発生
加来昌典，大石裕，須田亮，神成文彦，緑川克美
エクストリームフォトニクス研究 平成17年度報告書 2006年3月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Generation of Extreme Ultraviolet Continuum Radiation Driven by Sub-10-fs Two-Color Field 査読あり
Masanori Kaku, Yu Oishi, Akira Suda, Fumihiko Kannari, and Katsumi Midorikawa
Springer Series in Optical Sciences 132 Ultrafast Optics V 132 413 - 419 2006年1月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Kaku M., Oishi Y., Suda A., Kannari F., Midorikawa K.
Optics InfoBase Conference Papers 2006年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ. © 2005 Optical Society of America.
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Generation of extreme ultraviolet continuum radiation driven by a sub-10-fs two-color field
Oishi Y., Kaku M., Suda A., Kannari F., Midorikawa K.
Optics Express 14 ( 16 ) 7230 - 7237 2006年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Express
We have proposed and demonstrated a novel approach for generating high-energy extreme-ultraviolet (XUV) continuum radiation. When a two-color laser field consisting of a sub-10-fs fundamental and its parallel-polarized second harmonic was applied to high-order harmonic generation in argon, a continuum spectrum centered at 30 nm was successfully obtained with an energy as high as 10 nJ. This broadband emission indicates the possibility of generating intense single attosecond pulses in the XUV region. ©2006 Optical Society of America.
DOI： 10.1364/OE.14.007230
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Continuum high-order harmonic radiation in extreme ultraviolet region by sub-10-fs two-color field
Kaku M., Oishi Y., Suda A., Kannari F., Midorikawa K.
Optics InfoBase Conference Papers 2006年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ. © 2006 Optical Society of America.
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Kaku M., Oishi Y., Suda A., Kannari F., Midorikawa K.
Optics InfoBase Conference Papers 2006年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics InfoBase Conference Papers
When the laser field consisting of sub-10-fs fundamental and its second harmonic was used for high harmonic generation, a continuum centered at 30 nm with a spectral bandwidth of 8 nm was obtained with an energy of 10 nJ. © 2005 Optical Society of America.
DOI： 10.1364/up.2006.tha4
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Field-Free Alignment of Molecules Observed with High-Order Harmonic Generation 査読あり
Kenzo Miyazaki, Masanori Kaku, Godai Miyaji, A. Abdurrouf, and F. H. M. Faisal
Physical Review Letters 95 243903-1 - 243903-4 2005年12月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Field-free alignment of molecules observed with high-order harmonic generation
Miyazaki K., Kaku M., Miyaji G., Abdurrouf A., Faisal F.
Physical Review Letters 95 ( 24 ) 2005年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review Letters
High-order harmonic generation is demonstrated to provide a sensitive way for an extensive study of dynamic processes in the field-free alignment of strong-field-induced molecular rotational wave packets. The time-dependent harmonic signal observed from field-free-aligned N2, O2, and CO2 has been found to include two sets of beat frequency for pairs of coherently populated rotational states. One of them is the well-known frequency component characterizing the field-free alignment of molecules, and the other is ascribed to the beat that arises from coherence embedded in the wave packet. We discuss the effect of each frequency component on the revival signal observed with the harmonic generation. © 2005 The American Physical Society.
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サブ10 ｆｓ, 2カラーパルスを用いた高次高調波発生
加来昌典，大石裕，須田亮，石川顕一，モハメッド・ヌルフダ，神成文彦，緑川克美
レーザー学会第342回研究会報告 31 - 35 2005年12月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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Kaku M., Morichi R., Miyaji G., Miyazaki K.
IQEC, International Quantum Electronics Conference Proceedings 2005 1036 - 1037 2005年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IQEC, International Quantum Electronics Conference Proceedings
We report high-order harmonic generation from field-free aligning molecules, of which time-dependent signals represent the revival structure of a rotational wave packet formed by intense fs laser pulses. The harmonic signals from aligned N2, O2and CO2molecules represent the characteristic behaviors depending on the molecular structures.
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Frequency spectra in field-free revival structure of fs-laser-aligned molecules
Miyaji G., Kaku M., Miyazaki K.
IQEC, International Quantum Electronics Conference Proceedings 2005 1038 - 1039 2005年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：IQEC, International Quantum Electronics Conference Proceedings
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Reflectivity change in femtosecond-laser-induced ablation of diamond-like carbon film
Miyaji G., Kobayashi W., Kaku M., Miyazaki K.
Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest 2005 1427 - 1428 2005年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Pacific Rim Conference on Lasers and Electro-Optics, CLEO - Technical Digest
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サブ10 fs，2カラーパルスによる極端紫外域に連続スペクトルを有する高次高調波発生
加来昌典，大石裕，須田亮，神成文彦，緑川克美
第2回エクストリームフォトニクス研究会 66 - 67 2005年11月
記述言語：日本語 掲載種別：研究論文（その他学術会議資料等）
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High-order harmonic generation from femtosecond laser-aligned molecules 査読あり
Kenzo Miyazaki, Masanori Kaku, and Keita Masuda
Springer Series in Chemical Physics 79 Ultrafast Phenomena XIV 79 195 - 172 2005年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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High-order harmonic generation from femtosecond-laser aligned N2, O2 and CO2 molecules 査読あり
Masanori Kaku, Ryosuke Morichi, Godai Miyaji, Kenzo Miyazaki
Proceedings of IQEC and CLEO-PR 2005 1036 - 1037 2005年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Reflectivity change in femtosecond-laser-induced ablation of diamond-like carbon film 査読あり
Godai Miyaji, Wataru Kobayashi, Masanori Kaku, Kenzo Miyazaki
Proceedings of IQEC and CLEO-PR 2005 1427 - 1428 2005年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Frequency spectra in field-free revival structure of fs-laser-aligned molecules 査読あり
Godai Miyaji, Masanori Kaku, Kenzo Miyazaki
Proceedings of IQEC and CLEO-PR 1038 - 1039 2005年7月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Reflectivity in femtosecond-laser-induced structural changes of diamond-like carbon film
Miyazaki K., Maekawa N., Kobayashi W., Kaku M., Yasumaru N., Kiuchi J.
Applied Physics A: Materials Science and Processing 80 ( 1 ) 17 - 21 2005年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Applied Physics A: Materials Science and Processing
We report characteristic changes in reflectivity of diamond-like-carbon (DLC) films following irradiation of femtosecond laser pulses at laser fluence around the ablation threshold, where we have observed the formation of periodic nanostructure on the film surface and the modification of bonding structure from DLC to glassy carbon in our recent experiments. The experimental results have shown that the reflectivity change should be a reliable measure to monitor the experimental condition to produce the structural changes, being closely associated with the fundamental physical process to induce these phenomena.
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Vacuum ultraviolet Ar2* laser pumped by a high-intensity laser
Shoichi Kubodera, Masanori Kaku, Takeshi Higashiguchi, Junji Kawanaka
Proceedings of the Fourth Symposium on Advanced Photon Research 83 - 86 2004年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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High-order harmonic generation from femtosecond laser-aligned molecules
Miyazaki K., Kaku M., Masuda K., Miyaji G.
Springer Series in Chemical Physics 79 195 - 197 2004年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Springer Series in Chemical Physics
We report a sensitive method using high-order harmonic generation to detect revival structures in fs-laser-induced, field free alignment of a molecular rotational wave packet. The revival structure is directly observed on the time-dependent harmonic signal produced with the pump-probe technique. The harmonic signals for N2and O2represent the characteristic behaviors depending on the molecular structure.
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Reflectivity in femtosecond-laser-induced structural changes of diamond-like carbon film 査読あり
Kenzo Miyazaki, Norimasa Maekawa, Wataru Kobayashi, Masanori Kaku, Naoki Yasumaru and Junsuke Kiuchi
Applied Physics A 80 17 - 21 2004年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Masuda K., Miyazaki K.
Japanese Journal of Applied Physics, Part 2: Letters 43 ( 4 B ) 2004年4月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Japanese Journal of Applied Physics, Part 2: Letters
We report a new sensitive method using high-order harmonic generation to observe revival structure in fs-laser induced alignment of a rotational wave packet of molecules. Pump and probe fs-laser pulses with a time delay were focused collinearly into a pulsed N2gas jet, so that the pump pulse induces alignment of a ground-state rotational wave packet, and the delayed probe pulse produces harmonic radiation from the aligning molecules. The harmonic signal observed as a function of time delay has clearly demonstrated a typical time-dependent revival structure in the field-free alignment of molecules.
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Observation of Revival Structure in Femtosecond-Laser-Induced Alignment of N2 with High-Order Harmonic Generation 査読あり
Masanori Kaku, Keita Masuda, and Kenzo Miyazaki
Japanese Journal of Applied Physics 43 L591 - L593 2004年4月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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High-order harmonic generation from molecules spatially aligned by femtosecond laser pulses 査読あり
Masanori Kaku, Keita Masuda and Kenzo Miyazaki
Proceedings of The 4th Asian Pacific Laser Symposium ThE-B7 2004年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Femtosecond-laser-induced structural change of diamond-like carbon film 査読あり
Norimasa Maekawa, Wataru Kobayashi, Masanori Kaku, Kenzo Miyazaki, Naoki Yasumaru and Junsuke Kiuchi
Proceedings of The 4th Asian Pacific Laser Symposium ThP6 2004年3月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Kubodera S., Kaku M., Higashiguchi T., Sasaki W.
Conference on Lasers and Electro-Optics Europe - Technical Digest 2003年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Conference on Lasers and Electro-Optics Europe - Technical Digest
In this paper we have proposed a new excitation method to demonstrate a practical Ar/sub 2/* laser using a high intensity ultrashort pulse laser. A high intensity laser produced electrons will be utilized to initiate the Ar/sub 2/* production kinetics. We have observed a nonlinear increase of the Ar/sub 2/* emission intensity at 126 nm by changing the hollow fiber length. A small signal gain of 0.05 cm/sup -1/ was evaluated at 126 nm. Kinetic analysis revealed that the high intensity laser produced electrons via optical field ionization process actually initiated the Ar/sub 2/* production processes. This result is the first observation of the gain at 126 nm pumped by a compact device other than electron beam machine and will lead to the stimulated emission at 126 nm with a repetition rate of 10 Hz. © 2003 IEEE.
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Vacuum ultraviolet Ar2* excimer excited by an ultrashort pulse high intensity laser
Kaku M., Higashiguchi T., Kubodera S., Sasaki W.
Proceedings of SPIE - The International Society for Optical Engineering 5120 219 - 222 2003年12月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Proceedings of SPIE - The International Society for Optical Engineering
We have observed Ar 2 * emission at 126 nm by use of a high intensity laser pulse as an excitation source. Kinetic analysis revealed that high-intensity laser-produced electrons via optical field induced ionization (OFI) process initiated the Ar 2 * production kinetics. Ar 2 * production kinetics initiated by OFI electrons was mainly governed by the three-body association process, which was analogous to the case of electron beam excitation. The use of a hollow fiber controlled propagation characteristics of a high intensity laser pulse in a high-pressure gas, leading to the increase of the excimer emission intensity.
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Gain Observation of Vacuum Ultraviolet Ar2* Radiation at 126 nm Produced by an Ultrashort High Intensity Laser Pulse Propagating in a Hollow Fiber 査読あり
Masanori Kaku, Takeshi Higashiguchi, Shoichi Kubodera, and Wataru Sasaki
Optics Letters 28 804 - 806 2003年10月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Vacuum Ultraviolet Ar2* Excimer Excited by an Ultrashort Pulse High Intensity Laser 査読あり
Masanori Kaku, Takeshi Higashiguchi, Shoichi Kubodera, and Wataru Sasaki
Proc. SPIE Vol. 5120 5120 219 - 222 2003年9月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Vacuum ultraviolet argon excimer production by use of an ultrashort-pulse high-intensity laser 査読あり
Masanori Kaku, Takeshi Higashiguchi, Shoichi Kubodera, and Wataru Sasaki
Physical Review A 68 023803-1 - 023803-6 2003年8月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Vacuum ultraviolet argon excimer production by use of an ultrashort-pulse high-intensity laser
Kaku M., Higashieuchi T., Kubodera S., Sasaki W.
Physical Review A - Atomic, Molecular, and Optical Physics 68 ( 2 ) 238031 - 238036 2003年8月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review A - Atomic, Molecular, and Optical Physics
The observing of vacuum ultraviolet (VUV) argon excimer based on an ultrashort-pulse high-intensity laser propagation was investigated. The laser propagation under high pressure conditions resulted in the observing of argon emission at 126 nm. In regard with it, the optical-field-induced ionization (OFI) process that initiated argon formation kinetics was also discussed.
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Vacuum Ultraviolet Spectroscopic System Using a Laser-Produced Plasma
Kaku Masanori, Yamaura Takahiro, Higashiguchi Takeshi, Kubodera Shoichi, Sasaki Wataru
Japanese journal of applied physics. Pt. 1, Regular papers & short notes 42 ( 6 ) 3458 - 3462 2003年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics
We have developed a vacuum ultraviolet (VUV) spectroscopic system using a laser-produced plasma. Laser-produced rare gas plasma was initiated by a 10 Hz Q-switched YAG laser at the focused intensity of $10^{11}$ W/cm2. Among three different rare gas plasma emissions (He, Ne, and Ar), argon plasma was characterized by broad continuum emission with an integrated emission power of 8.4 kW in the VUV spectral region. The pulse width of the VUV emission of 62 ns (Full width at half maximum), which was governed by recombination processes in the plasma, determined the temporal resolution. Using this emission source, we have measured VUV transmission spectra of Nd3+:LaF3 crystal, which was a potential laser medium in the VUV. The transmission peak of the crystal coincided with the reported laser oscillation wavelength at 174 nm. The absorption coefficient at the wavelength was measured to be 0.7 cm-1.
DOI： 10.1143/JJAP.42.3458
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Vacuum ultraviolet spectroscopic system using a laser-produced plasma
Kaku M., Yamaura T., Higashiguchi T., Kubodera S., Sasaki W.
Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers 42 ( 6 A ) 3458 - 3462 2003年6月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
We have developed a vacuum ultraviolet (VUV) spectroscopic system using a laser-produced plasma. Laser-produced rare gas plasma was initiated by a 10 Hz Q-switched YAG laser at the focused intensity of 10 11 W/cm 2 . Among three different rare gas plasma emissions (He, Ne, and Ar), argon plasma was characterized by broad continuum emission with an integrated emission power of 8.4 kW in the VUV spectral region. The pulse width of the VUV emission of 62 ns (Full width at half maximum), which was governed by recombination processes in the plasma, determined the temporal resolution. Using this emission source, we have measured VUV transmission spectra of Nd 3+ :LaF 3 crystal, which was a potential laser medium in the VUV. The transmission peak of the crystal coincided with the reported laser oscillation wavelength at 174 nm. The absorption coefficient at the wavelength was measured to be 0.7 cm -1 .
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Kaku M., Higashiguchi T., Kubodera S., Sasaki W.
Optics Letters 28 ( 10 ) 804 - 806 2003年5月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Optics Letters
We observed a small-signal gain of Ar* 2 emission at 126 nm by use of a hollow fiber to guide the high-intensity laser propagation in high-pressure Ar. The small-signal gain coefficient was measured to be 0.05 cm -1 at 126 nm. Kinetic analysis revealed that the electrons produced by the high-intensity laser through an optical-field-induced ionization process initiated the Ar* 2 production processes. The increase in the emission intensity was measured to be exp(2.5), with an increase in the fiber length. © 2003 Optical Society of America.
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Vacuum Ultraviolet Spectroscopic System Using a Laser-Produced Plasma 査読あり
Masanori Kaku, Takahiro Yamaura, Takeshi Higashiguchi, Shoichi Kubodera, and Wataru Sasaki
Japanese Journal of Applied Physics 42 3458 - 3462 2003年1月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Vacuum Ultraviolet Spectroscopic System Using a Laser-Produced Plasma
Kaku Masanori, Yamaura Takahiro, Higashiguchi Takeshi, Kubodera Shoichi, Sasaki Wataru
Japanese Journal of Applied Physics 42 ( 6 ) 3458 - 3462 2003年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：公益社団法人 応用物理学会
We have developed a vacuum ultraviolet (VUV) spectroscopic system using a laser-produced plasma. Laser-produced rare gas plasma was initiated by a 10 Hz Q-switched YAG laser at the focused intensity of 10<SUP>11</SUP> W/cm<SUP>2</SUP>. Among three different rare gas plasma emissions (He, Ne, and Ar), argon plasma was characterized by broad continuum emission with an integrated emission power of 8.4 kW in the VUV spectral region. The pulse width of the VUV emission of 62 ns (Full width at half maximum), which was governed by recombination processes in the plasma, determined the temporal resolution. Using this emission source, we have measured VUV transmission spectra of Nd<SUP>3+</SUP>:LaF<SUB>3</SUB> crystal, which was a potential laser medium in the VUV. The transmission peak of the crystal coincided with the reported laser oscillation wavelength at 174 nm. The absorption coefficient at the wavelength was measured to be 0.7 cm<SUP>−1</SUP>.
DOI： 10.1143/jjap.42.3458
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Vacuum ultraviolet argon excimer production by use of an ultrashort-pulse high-intensity laser
Kaku M., Higashiguchi T., Kubodera S., Sasaki W.
Physical Review A - Atomic, Molecular, and Optical Physics 68 ( 2 ) 2003年
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Physical Review A - Atomic, Molecular, and Optical Physics
We report on the observation of [Formula Presented] emission at 126 nm by use of a hollow fiber to guide the high-intensity laser propagation in high-pressure Ar. A small-signal gain coefficient of [Formula Presented] was measured at 126 nm by this method. The increase of the [Formula Presented] emission intensity was measured to be [Formula Presented] with an increase of the fiber length up to 50 cm. Kinetic analysis revealed that the [Formula Presented] production processes were initiated by the electrons produced by the high-intensity laser through an optical-field-induced ionization (OFI) process. A rapid conductive cooling of the OFI electrons is favorable to initiate the [Formula Presented] formation kinetics more efficiently. This high-density cold plasma production method should be applicable for other vacuum ultraviolet rare-gas excimer lasers. © 2003 The American Physical Society.
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Vacuum Ultraviolet Ar2* Excimer Excited by a High Intensity Laser 査読あり
Masanori Kaku, Takahiro Yamaura, Hidenori Kodama, Shoichi Kubodera, and Wataru Sasaki
AIP Conference Proceedings Vol. 634 634 217 - 221 2002年12月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Vacuum ultraviolet emission from a laser-produced plasma and spectroscopic application to a solid state material 査読あり
Masanori Kaku, Takahiro Yamaura, Shoichi Kubodera, and Wataru Sasaki
Surface Review and Letters 9 615 - 619 2002年9月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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Kaku M., Yamaura T., Kubodera S., Sasaki W.
Surface Review and Letters 9 ( 1 ) 615 - 619 2002年2月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：Surface Review and Letters
Vacuum ultraviolet (VUV) continua emitted from a laser-produced plasma have been utilized for the spectroscopy of a solid state laser material. An absorption spectrum of 0.1%Nd:LaF 3 has been measured by use of the continuum emission. The minimum absorption coefficient of 1.4 cm -1 was evaluated at 174 nm.
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Vacuum Ultraviolet Transmission Spectroscopic System using a Laser-Produced Plasma
Masanori Kaku, Takahiro Yamaura, Hidenori Kodama, Shoichi Kubodera, and Wataru Sasaki
Proceedings of the Second Symposium on Advanced Photon Research 149 - 152 2001年11月
記述言語：英語 掲載種別：研究論文（国際会議プロシーディングス）
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Recent progress of advanced vacuum ultraviolet light sources and applications 査読あり
Shoichi Kubodera, Wataru Sasaki, Masanori Kaku, Takahiro Shirai, and Junji Kawanaka
Recent Research Development in Applied Physics 4 1 - 10 2001年8月
記述言語：英語 掲載種別：研究論文（学術雑誌）
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加来 昌典, 河仲 準二, 窪寺 昌一, 佐々木 亘
宮崎大學工學部紀要 27 163 - 168 1998年9月
記述言語：日本語 掲載種別：研究論文（学術雑誌） 出版者・発行元：宮崎大学
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放電励起希ガスエキシマをラマン活性媒質とした真空紫外レーザーの基礎研究
加来 昌典, 河仲 準二, 窪寺 昌一, 佐々木 亘
レーザー学会学術講演会年次大会講演予稿集 = Annual meeting, of the Laser Society of Japan digest of technical papers 18 1998年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）
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緒方 彰, 大串 健次, 加来 昌典, 河仲 準二, 窪寺 昌一, 佐々木 亘, 黒澤 宏
レーザー学会学術講演会年次大会講演予稿集 = Annual meeting, of the Laser Society of Japan digest of technical papers 16 1996年1月
記述言語：日本語 掲載種別：研究論文（学術雑誌）