Laser wake wave as a relativistic flying mirror

相対論的フライングミラーとしてのレーザーウエイク波

Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Ma, J.*; 福田 祐仁; Chen, L. M.*; 大東 出; 小倉 浩一; 本間 隆之; 林 由紀雄; 小瀧 秀行; 匂坂 明人; 森 道昭; Koga, J. K.; 河内 哲哉; 桐山 博光; 岡田 大; 川瀬 啓悟; 亀島 敬; 西森 信行; Ragozin, E. N.*; Faenov, A. Y.; Pikuz, T.*; 大道 博行; Bulanov, S. V.; 木村 豊秋*; 加藤 義章* ; 田島 俊樹

Pirozhkov, A. S.; Kando, Masaki; Esirkepov, T. Z.; Ma, J.*; Fukuda, Yuji; Chen, L. M.*; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Kotaki, Hideyuki; Sagisaka, Akito; Mori, Michiaki; Koga, J. K.; Kawachi, Tetsuya; Kiriyama, Hiromitsu; Okada, Hajime; Kawase, Keigo; Kameshima, Takashi; Nishimori, Nobuyuki; Ragozin, E. N.*; Faenov, A. Y.; Pikuz, T.*; Daido, Hiroyuki; Bulanov, S. V.; Kimura, Toyoaki*; Kato, Yoshiaki*; Tajima, Toshiki

A laser-driven strongly nonlinear wake wave near wave breaking can act as a partially reflecting relativistic mirror (the flying mirror). Such a mirror directly converts low-frequency counter-propagating radiation into high-frequency radiation, with a frequency multiplication factor proportional to the -factor squared. We present results of theoretical and experimental studies of a new coherent high-frequency radiation source based on the light reflection from the relativistic flying mirror. This source promises to generate intense coherent ultrashort XUV and X-ray pulses that inherit their temporal shape and polarization from the original optical-frequency (laser) pulses. Furthermore, the reflected radiation bears important information about the reflecting wake wave itself. We also discuss the non-trivial characteristics of the reflected radiation caused by the relativistic dynamics of the curved flying mirror.