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Kiriyama, Hiromitsu; Nakai, Yoshiki; Yamamoto, Yoichi*; Kanazawa, Shuhei; Daido, Hiroyuki; Kimura, Toyoaki
no journal, ,
no abstracts in English
Mori, Michiaki; Ogura, Koichi; Sagisaka, Akito; Kando, Masaki; Hayashi, Yukio; Daito, Izuru; Fukumi, Atsushi*; Yogo, Akifumi; Takai, Mamiko; Orimo, Satoshi; et al.
no journal, ,
The multi-TW laser system "JLITE-X (JAEA Laser system for laser-matter InTeraction Experiment)" was developed for studying on the laser-matter interaction in sub-relativistic regime. Two quasi-monoenergetic charged particle production experiments were conducted after laser system development. The first, we successfully generated quasi-monoenergetic proton beam by using phase rotator which based on the radio-frequency accelerator technique. The quasi-monoenergetic component was observed near 600 keV with 1 TW / 220 fs laser operation mode. The second, we also successfully generated quasi-monoenergetic electron beam with energy of 20 MeV in self-modulated laser-wakefield regime with 3 TW / 70 fs operation mode. These results were indicated that the multi-TW laser is useful for not only plasma physics research but also high-energy particle source and its applications.
Kiriyama, Hiromitsu; Mori, Michiaki; Daito, Izuru; Kotaki, Hideyuki; Nakai, Yoshiki; Shimomura, Takuya*; Tanoue, Manabu*; Akutsu, Atsushi; Okada, Hajime; Motomura, Tomohiro*; et al.
no journal, ,
We report on a high-peak-power, high-contrast laser system, which combines both conventional Ti:sapphire chirped-pulse amplification and optical parametric chirped-pulse amplification (OPCPA) techniques for use in experiments where relativistic effects dominate the physics. The stretched pulses are amplified in a 3-stage Type-I Bata-Barium Borate OPCPA to an energy level of 10 mJ with an amplification gain of 10
. The output pulses are then amplified in the subsequent Ti:sapphire amplifiers to an energy level of 2.9 J. Pulse compression down to 19 fs duration achieved after amplification indicates a peak power of 80 TW. The pre-pulse contrast is enhanced to better than 
within a few picoseconds before the main pulse. The thermal focal length of about 4 km is obtained.
Ochi, Yoshihiro; Hasegawa, Noboru; Kawachi, Tetsuya; Tanaka, Momoko; Nishikino, Masaharu; Kishimoto, Maki; Oba, Toshiyuki; Sugiyama, Akira
no journal, ,
Kiriyama, Hiromitsu; Mori, Michiaki; Nakai, Yoshiki; Shimomura, Takuya; Tanoue, Manabu*; Okada, Hajime; Kondo, Shuji; Kanazawa, Shuhei; Daito, Izuru; Sagisaka, Akito; et al.
no journal, ,
We demonstrate a high-contrast, high-intensity double chirped-pulse amplification (CPA) Ti:sapphire laser system using an optical parametric chirped-pulse (OPCPA) pre- amplifier. By injecting cleaned microjoule seed pulses into the OPCPA, a temporal contrast greater than 10
within picosecond times before the main femtosecond pulse is demonstrated with an output pulse energy of 1.7 J and a pulse duration of 30 fs, corresponding to a peak power of 60 TW at a 10 Hz repetition rate. This system uses a cryogenically-cooled Ti:sapphire final amplifier and generates focused peak intensities in excess of 10
W/cm
.
Bolton, P. R.
no journal, ,
Bulanov, S. V.
no journal, ,
Kiriyama, Hiromitsu; Terranova, F.*; Pegoraro, F.*
no journal, ,
In this paper we discuss the bandwidth enhancement that can be achieved in multi-joule optical parametric chirped pulse amplification (OPCPA) systems exploiting the tenability of parametric amplification. We demonstrate that a bandwidth enhancement up to 50 % is possible using multi-beam operation of OPCPA amplifiers.