J. Kawanaka
Osaka University
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Publication
Featured researches published by J. Kawanaka.
Japanese Journal of Applied Physics | 2005
Shigeki Tokita; J. Kawanaka; Masayuki Fujita; Toshiyuki Kawashima; Yasukazu Izawa
We have demonstrated a cryogenically cooled Q-switched Yb:YAG laser oscillator in a diode pump. A high average power of 74 W was obtained with a pulse energy of several mJ. The optical–optical efficiency was as high as 60%. The spatial beam profile was excellent at M2<1.4 with no additional compensation optics.
Advanced Solid-State Photonics (2006), paper WB8 | 2006
J. Kawanaka; Shigeki Tokita; Hajime Nishioka; Ken-ichi Ueda; Masayuki Fujita; Toshiyuki Kawashima; Hideki Yagi; Takagimi Yanagitani
30W active-mirror oscillator with a liquid-nitrogen-cooled Yb:YAG ceramics has been demonstrated in quasi-cw diode pump. The optical efficiency and slope efficiency were high at 62% and 71%, respectively, in both of free-running and Q-switching operation.
conference on lasers and electro-optics | 2005
Takashi Kurita; Toshiyuki Kawashima; Tadashi Ikegawa; Osamu Matsumoto; Ryo Yasuhara; Takashi Sekine; J. Kawanaka; Noriaki Miyanaga; Yasukazu Izawa; Hirofumi Kan; Yutaka Tsuchiya; Hiroyuki Furukawa; Tadashi Kanabe
A 1053-nm thermally-edge-controlled slab laser pumped by 800 kW peak power from 8,000 diode bars has been designed for the HALNA project. 20 J pulse energy in 10 ns at 10 Hz is being demonstrated.
conference on lasers and electro optics | 2005
Ryo Yasuhara; Toshiyuki Kawashima; T. Ikegawa; O. Matsumoto; Takashi Kurita; Takashi Sekine; Masahiro Miyamoto; Kouichi Iyama; Yutaka Tsuchiya; J. Kawanaka; Takayoshi Norimatsu; Masahiro Nakatsuka; Y. Izawa; Hiroyuki Furukawa
20-J pulse energy in 10 ns at 10 Hz thermally controlled zig-zag slab laser based on the scaling law up to 100 J is being demonstrated by 800-kW peak pump power from 8,000 diode bars.
conference on lasers and electro optics | 2005
Takashi Sekine; Toshiyuki Kawashima; Osamu Matsumoto; Ryo Yasuhara; Tadashi Ikegawa; Takashi Kurita; Y. Tsuchiya; J. Kawanaka; Takayoshi Norimatsu; Y. Izawa
High average power of 1 J at 10 Hz output diode-pumped regenerative ring amplifier system has been developed. 1 μJ output from fiber oscillator was amplified to Joule level by two large aperture Nd: YLF amplifier heads.
conference on lasers and electro optics | 2005
J. Kawanaka; Shigeki Tokita; Hajime Nishioka; Masayuki Fujita; Toshiyuki Kawashima; T. Yanagitani; Ken-ichi Ueda; Y. Izawa
An active-mirror oscillator with a cryogenically cooled Yb: YLF has been demonstrated for the first time. Output pulse energy was 40mJ and 3.4mJ for the free-running and Q-switching modes, respectively, in quasi-cw pump at 10Hz.
conference on lasers and electro optics | 2005
Takashi Kurita; Toshiyuki Kawashima; O. Matsumoto; Ryo Yasuhara; T. Ikegawa; Takashi Sekine; Hirofumi Kan; Hiroyuki Furukawa; T. Kanabe; J. Kawanaka; Noriaki Miyanaga; Masahiro Nakatsuka; Takayoshi Norimatsu; Y. Izawa
A 1053-nm zig-zag slab laser pumped by 290 kW peak power diode array generated 8.4 J pulse energy in 20 ns at 10 Hz, verifying the energy scaling for IFE driver development.
Applied Physics B | 2005
Shigeki Tokita; J. Kawanaka; Masayuki Fujita; Toshiyuki Kawashima; Y. Izawa
Laser Physics | 2005
J. Kawanaka; Shigeki Tokita; Hajime Nishioka; Masayuki Fujita; Koichi Yamakawa; Ken-ichi Ueda; Y. Izawa
Journal De Physique Iv | 2006
Toshiyuki Kawashima; Tadashi Ikegawa; J. Kawanaka; Noriaki Miyanaga; Y. Izawa; O. Matsumoto; Ryo Yasuhara; Takashi Kurita; Takashi Sekine; Masahiro Miyamoto; H. Kan; Hiroyuki Furukawa; S. Motokoshi; T. Kanabe
