Enhancement of photon number reflected by the relativistic flying mirror

相対論的飛翔鏡からの反射光子数の増大

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

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

Laser light reflection by a relativistically moving electron density modulation (flying mirror) in a wake wave generated in a plasma by a high intense laser pulse is investigated experimentally. A counter-propagating laser pulse is reflected and up shifted in frequency with a multiplication factor of 37-66, corresponding to the extreme ultraviolet wavelength. The demonstrated flying mirror reflectivity (from 310 to 210, and from 1.310 to 0.610 for the photon number and pulse energy, respectively) is close to the theoretical estimate for the parameters of experiment.