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Relativistic mirrors in plasmas — novel results and perspectivesa Kansai Photon Science Institute, Japan Atomic Energy Agency, 8-1-7 Umemidai, Kyoto, Kizugawa-shi, 619-0215, Japan b Prokhorov General Physics Institute of the Russian Academy of Sciences, ul. Vavilova 38, Moscow, 119991, Russian Federation c S I Vavilov State Optical Institute, Birzhevaya liniya 12, St. Petersburg, 199034, Russian Federation d ITMO University, Kronverksky Pr. 49, bldg. A, St. Petersburg, 197101, Russian Federation e Ioffe Institute, ul. Polytekhnicheskaya 26, St. Petersburg, 194021, Russian Federation ![]() In plasmas, the relativistic flying mirrors are thin and dense electron or electron—ion layers accelerated by the high intensity electromagnetic waves up to velocity close to the speed of light in vacuum; in nonlinear-media the refraction index modulations are induced by a strong electromagnetic wave. The reflection of the electromagnetic wave at the relativistic mirror results in its energy and frequency change. In the counter-propagation configuration the frequency of the reflected wave is multiplied by the factor proportional to the gamma-factor squared. This scientific area promises the development of the sources of ultrashort
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