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Relativistic tennis using flying mirror

飛翔鏡を用いた相対論的テニス

Pirozhkov, A. S.; 神門 正城; Esirkepov, T. Z.; Ma, J.-L.; 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; 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.-L.; Fukuda, Yuji; Chen, L. M.; Daito, Izuru; Ogura, Koichi; Homma, Takayuki; Hayashi, Yukio; Kotaki, Hideyuki; Sagisaka, Akito; Mori, Michiaki; Koga, J. K.; Kawachi, Tetsuya; Daido, Hiroyuki; Bulanov, S. V.; Kimura, Toyoaki; Kato, Yoshiaki; Tajima, Toshiki

We present the results of the proof-of-principle experiment for frequency upshifting of the laser pulse reflected from the flying mirror. Experimentally, the wake wave is created by a 2 TW, 76 fs Ti:S laser pulse (JLITE-X) in helium plasma $$(N_e approx 4-6 times 10^{19}$$ cm$$^{-3})$$. The incidence angle of the second laser pulse on the flying mirror is 45$$^circ$$, and the frequency upshifting factor is $$approx 3.4 gamma^2$$. The reflected signal is observed with a grazing-incidence spectrograph in 24 shots. ($$lambda = 7-14$$ nm, frequency upshifting factors =55-115, $$gamma approx 4-6$$). The reflected signal contains at least $$3 times 10^7$$ photons/sr. This effect can be used to generate coherent high-frequency ultrashort pulses that inherit temporal shape and polarization from the original (low-frequency) ones. Apart from this, the reflected radiation contains important information about the wake wave itself, e. g. location, size, phase velocity, etc.

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