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Demonstration of light reflection from the relativistic mirror

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

We present results of a proof-of-principle experiment and theoretical study of the frequency upshifting of the laser pulse reflected from the relativistic flying mirror. Experimentally, the breaking wake wave is created by a Ti:S laser pulse (2 TW, 76 fs) in helium plasma with the electron density of $$approx 4-6 times 10^{19}$$ cm$$^{-3}$$. The incidence angle of the second laser pulse on the flying mirror is 45$$^circ$$, so the frequency upshifting factor is $$approx 3.4 gamma^2$$. The reflected radiation is observed in 24 shots using a grazing-incidence spectrograph. The wavelength changes from 7 to 14 nm, which corresponds to the frequency upshifting factors of 50-110 and the $$gamma$$-factors of 4-6. The reflected signal contains at least $$3 times 10^7$$ photons/sr. The new source promises the generation of coherent ultrashort XUV and X-ray pulses with tunable wavelength and duration, with the possibility of focusing to record intensities.

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