The photon-photon scattering in vacuum can give rise to the second-harmonic generation of intense laser radiation in a dc magnetic field in the ``box'' diagram approximation of quantum electrodynamics if the symmetry of interaction is broken by modulation or/and nonuniformity of optical wave +dc field system in time or/and space. Specific examples considered here are: an optical pulse plane wave or a Gaussian laser beam propagating in uniform or nonuniform dc fields.
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Kaplan et al. (2000) studied this question.
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