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19 results on '"Y. Owadano"'

1. Flyer acceleration experiments using a KrF laser system with a long pulse duration and pressure and thickness of isobaric zone induced in impacted materials

Author

Kazuhisa Fujita, Kotaro Kondo, K. Takamatsu, Toshihiko Kadono, I. Matsushima, Y. Owadano, Masatake Yoshida, K. A. Tanaka, Norimasa Ozaki, Motohiro Nakano, Yasufumi Sasatani, Eiichi Takahashi, T. Matsumura, H. Ito, N.K. Mitani, and Hisataka Takenaka

Subjects
Shock wave, Materials science, business.industry, Tantalum, chemistry.chemical_element, Pulse duration, Diamond, engineering.material, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Intensity (physics), law.invention, Acceleration, Optics, chemistry, law, engineering, Isobaric process, Electrical and Electronic Engineering, business
Abstract

Flyer acceleration experiments are carried out using a KrF laser system with a pulse duration of 10–15 ns and an intensity of ∼1.0 × 1013 W/cm2. Three-layered targets (aluminum–polyimide–tantalum) are used. First, an average velocity of laser-driven tantalum flyers with a thickness of 4 and 8 μm is estimated. Then, in a collision of a flyer with a copper layer attached to a diamond plate, we measure a transit time of a shock wave in the diamond. The impact velocity is estimated based on the transit time and a numerical simulation. This numerical simulation also shows that the initial peak pressure caused by the impact of a 4-μm-thick flyer is kept at 11 Mbar for 12–13 μm in thickness. Finally, whether this thickness is enough for EOS measurements is discussed.

Published
2001
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2. C. レーザーエネルギー応用

Author

S. Yamagami, H. Daido, H. Nagatomo, M. Suzuki, Y. Murakami, Li Woo Choi, H. Fiedorowicz, A. Bartnik, R. Rakowski, W. Yu, A. Sasaki, T. Utsumi, K. Moribayashi, T. Kawachi, M. Kado, N. Hasegawa, Y. Ueshima, T. Tajima, Yuzo Nagumo, Shigeki Hayashi, Takashi Yagi, Takeshi Matsumura, Susumu Yamazaki, Isao Kojima, Kazumasa Honda, A. Shimoura, T. Mochizuki, S. Miyamoto, S. Amano, Denis Joyeux, Daniel Phalippou, Gerard Jamelot, E. Takahashi, I. Okuda, Y. Matsumoto, I. Matsushima, S. Kato, K. Kuwahara, Y. Owadano, M. Iwasaki, T. Jitsuno, S. Motokoshi, N. Nishi, M. Nakatsuka, Koichi Mori, Kimiya Komurasaki, Yoshihiro Arakaw, M. Ishimoto, S. Uchida, K. Imasaki, X. Zhou, S. Sakabe, N. Kawashima, Shinichirou OKIHARA, Fuminobu SATOA, Takehiro SHIMADA, Kouji TAKAHASHI, Yusuke SAKABE, Takayoshi NORIMA'TUA, Yasukazu IZAWAA, Toshiyuki IIDA, Kazuhisa NAKAJIMA, Shuhei KANAZAWA, Masaki KANDO, Shuji KONDO, Hideyuki KOTAKI, Hideki DEWA, Tomonao HOSOKAI, M. YODA, Y. BABA, N. MUKAI, Y. SANO, T. OGlSU, M. Yamaura, S. Ihara, S. Satoh, C. Yamabe, S. Nozawa, Y. Shimada, A. Ogata, T. Yamanaka, C. Yamanaka, Y. Ishikubo, and K. Kawabata

Published
2000
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3. Compression of high-power KrF laser pulse by backward Raman scattering using focused geometry

Author

Yuji Matsumoto, Y. Owadano, Eiichi Takahashi, and K. Kuwahara

Subjects
Materials science, business.industry, chemistry.chemical_element, Geometry, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, Pulse (physics), Intensity (physics), law.invention, symbols.namesake, Optics, X-ray Raman scattering, Xenon, chemistry, law, symbols, Coherent anti-Stokes Raman spectroscopy, Electrical and Electronic Engineering, business, Raman spectroscopy, Raman scattering
Abstract

We are working on the generation of the high-power UV pulse by backward Raman pulse amplification. This report deals with the generation of the high-power backward first Stokes light using a simple focusing geometry. The high-power Stokes light, which grows from spontaneous scattered light in the focal region, can be obtained by focusing the high-energy KrF pump pulse into a Raman cell filled with methane gas. The intensity of the pump pulse increases significantly near the focus. This pulse produces a serious effect of the nonlinear refractive index. We mixed xenon gas into the Raman medium to compensate for this effect. As a result, a stable generation of the high-power single backward first Stokes light can be obtained.

Published
1999
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4. Overview of 'Super-ASHURA' KrF Laser Program

Author

H. Yashiro, M Shinbo, Y Owadano, Eisuke Miura, Y Matsumoto, I Matsushima, T. Tomie, I. Okuda, Kenji Kuwahara, and E. Takahashi

Subjects
Materials science, Raman amplification, business.industry, Filling factor, Mechanical Engineering, Amplifier, Energy conversion efficiency, Nanosecond, Laser, Pulse (physics), law.invention, symbols.namesake, Optics, Nuclear Energy and Engineering, law, symbols, General Materials Science, business, Raman scattering, Civil and Structural Engineering
Abstract

In the Super-ASHURA KrF Laser at ETL, a main amplifier with full pumping duration (270 ns) and 12 beam lines have been completed. At present, total output energy of 2.7 kJ has been extracted from the main amplifier by double-pass amplified 12 beams (20 ns×12) with an aperture filling factor of 74%. Local intrinsic efficiency has reached 10%. In the Raman amplification which is to be used for high peak power pulse generation, multi-pass forward amplification of nanosecond Stokes pulse showed an energy conversion efficiency of 73%. Also, a multi-joule short Stokes pulse (150 ps) has been obtained from 12.5 J, and 20 ns pulse by saturated backward amplification of a self-generated Stokes pulse. To investigate the effect of irradiation smoothness, the two-dimensional profile of the target rear surface displacement has been measured by using short (

Published
1999
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5. Performance of the 'Super-ASHURA' main amplifier

Author

Toshihisa Tomie, Hidehiko Yashiro, Eiichi Takahashi, Y. Owadano, Isao Okuda, Eisuke Miura, Yuji Matsumoto, and Isao Matsushima

Subjects
Physics, Optics, Nuclear Energy and Engineering, law, business.industry, Mechanical Engineering, Amplifier, General Materials Science, Laser, business, Energy (signal processing), Civil and Structural Engineering, law.invention
Abstract

The ` Super-ASHURA ' KrF laser system is currently under development at the Electrotechnical Laboratory. An electron-beam pumped large-aperture KrF laser amplifier named ` Amp4 ' has been completed and is operational as the main amplifier. Amp4 and the currently operating ` ASHURA ' pre-amplifiers (660 J, six beams) have been combined to form the upgraded system. Laser energy extraction experiments from Amp4 have been started (2.3 kJ, 12 beams).

Published
1999
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6. Forward Raman pulse compression experiments by using ASHURA

Author

Y. Owadano, Yuji Matsumoto, Isao Matsushima, Eiichi Takahashi, Isao Okuda, and Kenji Kuwahara

Subjects
Materials science, business.industry, Mechanical Engineering, Physics::Optics, Laser, Pulse (physics), Intensity (physics), law.invention, symbols.namesake, Optics, Nuclear Energy and Engineering, law, Pulse compression, Cathode ray, symbols, Energy transformation, General Materials Science, Coherent anti-Stokes Raman spectroscopy, Raman spectroscopy, business, Civil and Structural Engineering
Abstract

We have developed a useful method for power multiplication of KrF laser light, called forward Raman pulse compression. In this method, a multi-pass forward Raman amplifier is used. Adjustment of incident timing between pump and Stokes light into each path provides efficient Raman energy conversion from long KrF laser to short pulse Stokes light. Even in the case of double path configuration, output Stokes was demonstrated to grow up to 1.3 times the pump intensity. By using an intersecting multi-path of Stokes and pump light, spatial non-uniformity of the output Stokes reduced to less than 5%.

Published
1999
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7. Compression of high power KrF laser pulse by backward Raman amplification

Author

I Matsushima, Y Owadano, Kenji Kuwahara, Y Matsumoto, I. Okuda, and E. Takahashi

Subjects
Power gain, Raman amplification, Materials science, business.industry, Mechanical Engineering, Energy conversion efficiency, Laser, law.invention, Pulse (physics), symbols.namesake, Optics, Nuclear Energy and Engineering, Pulse compression, law, symbols, Optoelectronics, Stokes parameters, General Materials Science, Raman spectroscopy, business, Civil and Structural Engineering
Abstract

Backward Raman pulse compression of high-power KrF laser using focused geometry was investigated. This simple configuration has various advantages suitable for creating not only high-power but also high-energy Stokes pulses. An energy conversion efficiency of 27% and power gain of 30 have been achieved.

Published
1999
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8. C. レーザーエネルギー応用

Author

H. Daido, N. Sakaya, Stephane Sebban, J. Tajima, M. Suzuki, M. Matsumura, V. Kmetik, H. Fiedorowicz, A. Bartnik, M. Szczurek, T. Wilhein, H. Matsuyama, H. Kumagai, Y. Iimura, K. Midorikawa, M. Obara, E. Takahashi, K. Kuwahara, Y. Matsumoto, Y. Owadano, I. Matsushima, I. Okuda, T. Tomie, E. Miura, H. Yashiro, S. Kato, Tsuyosi Fukuda, Hitoshi Nakano, Uichi Kubo, S. Murayama, T. Norimatu, T. Yamanaka, Hiromi Fujii, Satomi Hattori, Aki Shimamura, Tadao Konishi, Hiroki Yoshida, Yukio Sakagami, Akihito Hongo, Mitsunobu Miyagi, Y. Shimada, S. Uchida, H. Yasuda, S. Motokoshi, K. Tsubakimoto, M. Fujita, M. Hashida, Y. Ishikubo, Z. I. Kawasaki, M. Adachi, C. Yamanaka, H. Niki, K. Maruyama, H. Sawazaki, T. Nishimura, I. Kitajima, Changhwan LIM, Satoshi MORIKAWA, Koji NAGASAKA, Kaname OKADA, Yasukazu IZAWA, Y. Kato, H. Yoshida, H. Fujita, S. Nakai, S. Kawana, H. Asai, H. Yoneda, K. Ueda, Hisanao Hazama, Kazuyoshi Koyama, Mitsumori Tanimoto, Tohru Urano, Hiroki Ueyama, Tomoyuki Kuge, Sakae Kawato, and Shuji Sakabe

Published
1998
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9. レーザーエネルギー応用

Author

Mitsuhiro Kusaba, Masahide Kawamoto, Yoshiaki Tsunawaki, Nobuaki Nakashima, Yasukazu Izawa, Keisuke Shimizu, Masaki Hashida, Shuji Sakabe, Changhwan LIM, Keiji NOMARU, Kouji NAGASAKA, T. Masuda, K. Maruyama, K. Tsukasaki, H. Niki, I. Kitazima, Tomonao Hosokai, Satoshi Kokaji, Hikaru Hanajima, Mitsuo Nakajima, Takayuki Aoki, Masao Ogawa, Kazuhiko Horioka, G. Y. Yoon, T. Imani, H. Hirose, S. Sezaki, T. Jitsuno, H. Daido, K. Murai, M. Nakatsuka, Y. Kato, M. Takagi, K. Mima, S. Wang, Y. Gu, Z. Lin, G. Huang, H. Tang, D. Ximing, G. Zhang, S. Wan, S. Amano, A. Shimoura, S. Miyamoto, T. Mochizuki, H. Kumagai, K. Kobayashi, Y. Iimura, K. Toyoda, M. Obara, J. H. Park, S. Matsuoka, N. Miyanaga, K. Tsubakimoto, A. Morimoto, T. Kobayashi, S. Nakai, Thierry Bontoux, H. Matsui, T. Eguchi, T. Kanabe, M. Yamanaka, I. Okuda, E. Takahashi, I. Matsushima, Y. Matsumoto, H. Yashiro, E. Miura, Y. Owadano, Kenji Yasufuku, Hiroki Yoshida, Yukio Sakagami, Shinya Yamadori, Tadao Konishi, M. Nakasuji, H. Shiraga, M. Heya, H. Azechi, Tatsuhiko Yamanaka, N. Hasegawa, S. Kawana, H. Asai, H. Yoneda, K. Ueda, Keizo KONO, Kousuke YAGI, Takumi MINEMOTO, Yasuyuki Watada, Zenichirou Kawasaki, Sigeaki Uchida, Yosinori Shimada, Hirohiko Yasuda, Chiyoe Yamanaka, Satoshi MORIKAWA, H. Takenaka, and H. Yoshida

Published
1997
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10. レーザーエネルギー応用

Author

A. Rousse, S. Ninomiya, G. Yuan, K. Murai, R. Kodama, H. Daido, Y. Kato, S. Nakai, K. Miyazawa, H. Hirose, T. Hara, Y. Yamashita, S. Iwai, K. Kodate, Y. Aoyagi, K. Ando, T. Zhang, L. B. Sharma, M. Nakatsuka, H. Uematsu, Y. Izawa, T. Kitada, C. Yamanaka, N. Hasegawa, H. Nakagawa, T. Tsutaki, H. Yoneda, K. Ueda, H. Takuma, S. Matsuoka, A. Ando, S. Urusihara, N. Morio, T. Kawasaki, K. Suzuki, S. Amano, N. Miyanaga, T. Kanabe, I. Okuda, H. Yashiro, Y. Matsumoto, E. Takahashi, E. Miura, Y. Owadano, Shima Miyagawa, Kenji Yasufuku, Hiroki Yoshida, Yukio Sakagami, Gen Ohashi, Tomonori Mizutani, V. KMETIK, H. YOSHIDA, H. FUJITA, T. YAMANAKA, Mitsuhiro Kusaba, Nobuaki Nakashima, Yoshiaki Tsunawaki, Yukio MITANI, Gakuji EDA, Hideyuki UJIHARA, Kazuhiro WADA, Katsuaki Akaoka, Ikuo Wakaida, and Takashi Arisawa

Published
1995
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11. Beam-smoothing effect in broad-band random-phase irradiation

Author

Yuji Matsumoto, Isao Matsushima, K. Koyama, M. Yano, Y. Owadano, R. Staffin, Isao Okuda, and Toshihisa Tomie

Subjects
Materials science, business.industry, Physics::Optics, Broad band, Condensed Matter Physics, Laser, Atomic and Molecular Physics, and Optics, law.invention, Optics, law, Irradiation, Electrical and Electronic Engineering, business, Inertial confinement fusion, Smoothing, Beam smoothing
Abstract

A new technique to achieve smooth laser irradiation profiles on laser fusion targets is evaluated numerically and experimentally. In this technique, smoothing is obtained by using a spectral dispersing optic and a random-phase plate placed in front of a focusing lens employing the broad-bandwidth of KrF lasers. Experimental results and numerical calculations agree well, verifying that this simple optical system is effective for smooth irradiation on targets.

Published
1993
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12. Performance of the ASHURA KrF laser and its upgrading plan

Author

Isao Okuda, Toshihisa Tomie, Y. Owadano, K. Koyama, Yuji Matsumoto, Isao Matsushima, and M. Yano

Subjects
Optics, Materials science, business.industry, law, Plan (drawing), Electrical and Electronic Engineering, Condensed Matter Physics, business, Laser, Atomic and Molecular Physics, and Optics, law.invention
Abstract

Achieved performance of and the future plan for the ASHURA, a 700-J KrF laser, are described. Nanosecond pulses (3–20 ns) with a bandwidth of 50 cm-1 have been produced by gain switching of a preamplifier. The pulses have been six-time angularly multiplexed and double-pass amplified by two electron-beam-pumped amplifiers. The output from the main amplifier is strongly saturated, and maximum energy of 660 J has been extracted in 90 ns with a stage gain of 40. Focused by an f = 1m spherical lens, maximum power density of 6 × 1014 W/cm2 can be obtained on target. The energy density ratio of prepulse on target has been suppressed below 1/107. The ASHURA is being upgraded by adding a next-stage amplifier that aims at 10-kJ output energy in 270 ns.

Published
1993
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13. X-ray lithography using a KrF laser-plasma source

Author

F. O'Neill, I. C. E. Turcu, Y. Owadano, and M. C. Gower

Subjects
Materials science, Gas laser, business.industry, Materials Science (miscellaneous), Extreme ultraviolet lithography, Plasma, Laser, Industrial and Manufacturing Engineering, law.invention, Optics, Resist, law, X-ray lithography, Business and International Management, business, Lithography, Next-generation lithography
Published
2010

14. A. レーザー物理・化学

Author

T. Matsuyama, M. Mukai, H. Horinaka, K. Wada, T. Nakanishi, S. Okumi, K. Togawa, T. Baba, K. Kasai, G. Jiangrui, C. Fabre, K. Kanou, H. Kobune, K. Motomura, T. Yamamoto, M. Matsuoka, F. Kuwashima, I. Kitazima, H. Iwasawa, M. Shinozuka, A. Uchida, T. Ogawa, F. Kannari, Juniti Higuti, Norihiko Nishizawa, Toshio Goto, Masakazu Mori, Kazuo Yamane, K. Nukihara, H. Fukuti, N. Sokabe, K. Fujii, S. Oonaru, Nori Taniguchi, Kenshi Takahashi, Yutaka Matsumi, S. M. Dylewski, J. D. Geiser, P. L. Houston, Min-Kyu KIM, Hiroyuki ISII, Takayuki TAKAO, Yuji OKI, Mitsuo MAEDA, Yutaka Akahane, Akito Sagisaka, Makoto Aoyama, Sin-ichi Matsuoka, Fumihiko Nakano, Koichi Yamakawa, Penggian Wang, Akira Suda, Katsumi Midorikawa, Nguyen Hong Shon, Koichi Yoshioka, Shigenobu Okutani, Kiyotaka Kawai, Yoshio Cho, M. Kakehata, R. Ueda, H. Takada, K. Torizuka, M. Obara, Hiroyuki Nagai, K. Kuwahara, E. Takahashi, Y. Matsumoto, I. Matsushima, I. Okuda, Y. Owadano, M. Fujimoto, S. Aoshima, M. Hosoda, Y. Tsuchiya, K. Kusakabe, N. Kon, H. Nishioka, K. Ueda, T. Ishizaka, Y. Takagi, Parhat Husayin, Nilesh J. Vasa, Tatsuo Okada, Masaru Nakamura, Hirokazu Taniguchi, H. Sawada, S. Uchida, Kotyayev Oleg, T. Nakayama, Oleg G. Kotyayev, K. Hayasaka, H. Imajo, U. Tanaka, R. Ohmukai, S. Urabe, M. Watanabe, and K. Matsubara

Published
2000
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16. Improvement of discharge guiding effect using strongly and weakly ionized plasma channels for laser triggered lightning

Author

T. Kawabata, K. Midorikawa, Shigeki Hayashi, Takashi Noguro, H. Tang, Isao Kojima, Yukio Sakagami, Kazumasa Honda, Minoru Obara, Kazuhisa Hashimoto, T. Kawachi, S. Uchida, Masayuki Suzuki, Zen-Ichiro Kawasaki, Y. Ishikubo, Kozo Hirose, I. Okuda, Tetsuzi Hattori, Y. Owadano, S. Yamagami, Koji Nagasaka, Hideo Hirose, E. Fujiwara, Nobuki Kawashima, Chanhwan Lim, Takahisa Jitsuno, K. Ando, C. Yamanaka, Tsuyoshi Fukuda, Iwao Kitazima, Kazunobu Maruyama, Y. Shimada, A. Bartnikc, E. Takahashi, H. Fiedorowicz, Yoko Nakano, Saori Ojika, O. Maya, S. Sebban, K. Murai, A. Klisnik, Yasukazu Izawa, Hideaki Niki, Tamio Hara, Satoshi Nakamoto, C. Fujikawa, Hitoshi Nakano, Junko Yamada, T. Ohchi, Goichi Ohmae, Norio Tsuda, N. Tohyama, K. Okasaka, H. Daido, Aki Shimamura, Takeyoshi Nakayama, Y. Komatsu, Takamasa Hayasaka, Huajing Tang, Takashi Yagi, P. Zeitaun, Yasuhiro Yamashita, Yasusi Takizawa, Ryuuji Sugimoto, Kazuya Takeda, Yutaka Nagata, Y. Matsumoto, Atsushi Fujii, S. Wang, T. Yamanaka, A. Ogata, K. Kuwahara, N. Sakaya, N. Yamaguchi, Hiroki Yoshida, G. Huang, D. Shimoda, Hideaki Kusama, Jun Yamada, Y. Kato, S. Kato, and Y. Gu

Subjects
Physics, law, Ionization, Plasma, Atomic physics, Laser, Lightning, law.invention
Published
1999
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17. Picosecond high power KrF laser system for X-ray laser research

Author

Akira Yaoita, Y. Owadano, Yuji Matsumoto, Isao Matsushima, S. Komeiji, Mitsumori Tanimoto, M. Yano, K. Koyama, Isao Okuda, and Toshihisa Tomie

Subjects
X-ray laser, Optics, Materials science, law, business.industry, Picosecond, Electrical and Electronic Engineering, Condensed Matter Physics, Laser, business, Atomic and Molecular Physics, and Optics, law.invention, Power (physics)
Abstract

Fundamental parameters are studied for the detailed design of a picosecond high power KrF laser system. The saturation energy density of 2.3 mJ/cm2and gain recovery time of 1.9 ns in ane-beam pumped KrF laser are observed. A 6 ps pulse is amplified to 1.9 J. The system at the Electrotechnical Laboratory is expected to deliver 10 ps pulses with total energy of several tens of joules in several beams.

Published
1990
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18. Development of a high-power KrF laser system, ASHURA

Author

Toshihisa Tomie, Y. Owadano, Isao Okuda, Mitsumori Tanimoto, K. Koyama, M. Yano, and Yuji Matsumoto

Subjects
Materials science, Maximum power principle, business.industry, Amplifier, Condensed Matter Physics, Laser, Multiplexing, Atomic and Molecular Physics, and Optics, Pulse (physics), law.invention, Optics, law, Wall-plug efficiency, Electrical and Electronic Engineering, business, Beam (structure), Power density
Abstract

The present status of the development of a high-power KrF laser system, Ashura, is described. The main amplifier has generated 710 J (95 ns) at the pumping density of 1·lMW/cm3 with the wall plug efficiency of 2·0%. Maximum power of 9·0 GW (200 J/22 ns) per beam has been obtained from the beam lines of six-time pulse multiplexing. Power density of 1 × 1014 W/cm2 has been achieved on target with a 10−6 pre-pulse.

Published
1989
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