論文 - 加来 昌典
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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.