論文 - 加来 昌典
-
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.
-
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）
-
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）
-
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）
-
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.
-
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.
-
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）
-
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）
-
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）
-
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.
-
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
-
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 .
-
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.
-
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）
-
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
-
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.
-
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）
-
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）
-
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.
-
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）