Laser light reflection by a relativistically moving electron density modulation (flying mirror) in a wake wave generated in a plasma by a high intensity laser pulse is investigated experimentally. A counterpropagating laser pulse is reflected and upshifted in frequency with a multiplication factor of 37--66, corresponding to the extreme ultraviolet wavelength. The demonstrated flying mirror reflectivity (from 3×10^-6 to 2×10^-5, and from 1.3×10^-4 to 0.6×10^-3, for the photon number and pulse energy, respectively) is close to the theoretical estimate for the parameters of the experiment.
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Kando et al. (2009) studied this question.
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