Abstract
Phase-conjugate backscattering in photorefractive (PR) materials, which can be considered a special case of two-beam coupling, involves interaction between two counterpropagating beams via light-induced reflection gratings. Since this backscattering results from interference between the beams, it requires mutual temporal coherence. Moreover, when one beam is self-generated, the input beam is required to have a long coherence length.
© 1991 Optical Society of America
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