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Laser wake wave as a relativistic flying mirror

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 $$gamma$$-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.

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