Abstract
It has been shown that counterpropagating electromagnetic waves with different frequencies generate two lattices in a cubically nonlinear medium, one of which moves at a superluminal velocity. When weak radiation reflects from the superluminal lattice, the wavefront is quasi-conjugated with distortions owing to the Doppler frequency shift. These effects occur both in insulators with fast nonlinearity and in an electron-positron vacuum.
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Original Russian Text © N.N. Rosanov, 2012, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2012, Vol. 95, No. 12, pp. 689–692.
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Rosanov, N.N. Superluminal parametric Doppler effect in insulators and in an electron-positron vacuum. Jetp Lett. 95, 609–612 (2012). https://doi.org/10.1134/S0021364012120132
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DOI: https://doi.org/10.1134/S0021364012120132