Shinichi Matsuoka
Japan Atomic Energy Research Institute
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Featured researches published by Shinichi Matsuoka.
Optics Letters | 1998
K. Yamakawa; Makoto Aoyama; Shinichi Matsuoka; T. Kase; Y. Akahane; Hiroshi Takuma
We developed a compact three-stage Ti:sapphire amplifier laser system that produced peak power in excess of 100 TW for a pulse duration of less than 19 fs and an average power of 19 W at a 10-Hz repetition rate. A final 40-mm-diameter Ti:sapphire amplifier is pumped by a Nd:YAG master-oscillator-power-amplifier system that produces ~7-J output of 532-nm radiation. The spatial beam quality is approximately 2 times diffraction limited for the full amplified compressed output pulse. With f/3 optics, this system should therefore be capable of producing a focused intensity of ~3x10(20) W/cm(2) .
Optics Letters | 1998
K. Yamakawa; Makoto Aoyama; Shinichi Matsuoka; Hiroshi Takuma; C. P. J. Barty; David N. Fittinghoff
We describe a two-stage Ti:sapphire amplifier laser system that is capable of producing 16-fs pulses of 10-TW peak power at a 10-Hz repetition rate. Thin solid etalons were used to control gain narrowing and gain saturation during amplification. A cylindrical mirror expander was used to permit compensation of the dispersion of the system. An efficiency greater than 90% of the theoretical maximum for conversion of 532-nm pump light to 790-nm radiation is demonstrated.
Journal of The Optical Society of America B-optical Physics | 2000
Shinichi Matsuoka; Koichi Yamakawa
We demonstrate single-shot wave-front measurements of high-peak-power 100-fs laser pulses using the Fresnel phase-retrieval method. The wave fronts are reconstructed from only two intensity distributions at two planes along the optical axis and are measured by means of simple charge-coupled-device cameras. Wave fronts of a terawatt-class laser pulse are measured to be better than 0.36λ, peak to valley, when compared with the measured far-field intensity distributions of the beam.
Optics Communications | 2000
Hiromitsu Kiriyama; Shinichi Matsuoka; Yoichiro Maruyama; Takashi Arisawa
Abstract A four-pass quadrature frequency conversion scheme was developed to generate green output with high efficiency for pumping an ultrashort pulse laser system. With this scheme, an efficiency from fundamental energy into total second harmonic energy in excess of 80% was achieved for frequency doubling of 1064 nm in KTP with a low input fundamental laser intensity of 76 MW/cm 2 . A total second-harmonic output of 486 mJ was obtained with 607 mJ of the input 1064-nm fundamental laser at 10 Hz.
High-power lasers and applications | 2000
Hiromitsu Kiriyama; Shinichi Matsuoka; Yoichiro Maruyama; Tohru Matoba; Takashi Arisawa
A novel frequency converter architecture of four-pass quadrature frequency conversion scheme was developed aiming to achieve high conversion efficiency. A high conversion efficiency of more than 80% has been achieved in this scheme for frequency doubling of 1064-nm in KTP with a low input fundamental laser intensity of 76 MW/cm2. A second- harmonic output of 486 mJ was obtained with 607 mJ of the input 1064-nm fundamental laser at 10 Hz.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2000
Hiromitsu Kiriyama; Shinichi Matsuoka; Yoichiro Maruyama; Takashi Arisawa
Abstract A four-pass quadrature frequency conversion scheme was developed for achieving high conversion efficiency. With this scheme, an efficiency in excess of 80% was achieved for frequency doubling of 1064 nm in KTP with a low input fundamental laser intensity of 76 MW / cm 2 . A second-harmonic output of 486 mJ was obtained with 607 mJ of the input 1064 nm fundamental laser at 10 Hz.
Symposium on High-Power Lasers and Applications | 2000
Hiromitsu Kiriyama; Shinichi Matsuoka; Yoichiro Maruyama; Takashi Arisawa
A four-pass quadrature frequency conversion scheme was developed to generate green output with high efficiency for pumping an ultrashort pulse laser system. With this scheme, a efficiency from fundamental energy into total second harmonic energy in excess of 80% was achieved for frequency doubling of 1064-nm in KTP with a low input fundamental laser intensity of 76 MW/cm2. A total second-harmonic output of 486 mJ was obtained with 607 mJ of the input 1064- nm fundamental laser at 10 Hz.
Superstrong fields in plasmas | 1998
K. Yamakawa; Makoto Aoyama; Shinichi Matsuoka; Y. Akahane; Hiroshi Takuma; David N. Fittinghoff; C. P. J. Barty
We have developed a two-stage Ti:sapphire amplifier system, which is capable of producing 16 fs, 10 TW pulses at a 10 Hz repetition rate. We also describe an extension of this system to a peak power of 100 TW and an average power of 20 W level.
Archive | 1998
Koichi Yamakawa; Makoto Aoyama; Shinichi Matsuoka; Teiji Kase; Y. Akahane; Hiroshi Takuma; David N. Fittinghoff; C. P. J. Barty
We have developed a compact three-stage Ti:sapphire amplifier laser system that produces a peak power in excess of 100 TW for a pulse duration of less than 19 fs and an average power of 19 W at 10 Hz repetition rate. The spatial beam quality is about twice the diffraction limited for the full amplified, compressed output pulse.
Applied Sciences | 2013
Hiromitsu Kiriyama; Takuya Shimomura; Michiaki Mori; Yoshiki Nakai; Manabu Tanoue; Shuji Kondo; Shuhei Kanazawa; Alexander S. Pirozhkov; Timur Zh. Esirkepov; Y. Hayashi; K. Ogura; Hideyuki Kotaki; Masayuki Suzuki; I. Daito; Hajime Okada; Atsushi Kosuge; Y. Fukuda; Mamiko Nishiuchi; M. Kando; Sergei V. Bulanov; Keisuke Nagashima; Mitsuru Yamagiwa; Kiminori Kondo; Akira Sugiyama; Paul R. Bolton; Shinichi Matsuoka; Hirofumi Kan