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We demonstrate a new type of scattering process induced by two mutually incoherent beams in photorefractive crystals. The input beams may be of different colors. Dark and bright scattering patterns were obtained by control of an external electric field. The effect results from an angular selectivity of the amplified noise. It involves an enhancement of shared gratings, induced by each input beam with a specific part of its noise, in a foward four-wave-mixing process.
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Horowitz et al. (1992) studied this question.
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