Abstract
An experimental investigation of the geometry of a double phase-conjugate mirror in a photorefractive strontium barium niobate crystal is carried out. A shift of the transverse intensity distributions of scattered beams with respect to those of pump beams and a sublinear dependence of the scattered-beam power ratio on the power ratio of the pump beams are observed. The experimental results are interpreted on the basis of a two-dimensional model that accounts for both four-wave mixing and fanning.
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