Abstract
Numerical calculation of the two-wave mixing gain factor for arbitrary orientation of the holographic grating vector using the coupled wave theory developed for optically active electro-optic crystal enabling pump-beam depletion is presented. Two-dimensional angular dependencies of the gain factor are measured in Bi<sub>12</sub>TiO<sub>20</sub> photorefractive crystal under an alternating external electric field using the fanning effect. It is found experimentally that the angular ditribution of fanning light is independent of the polarization state of the pump beam. This fact could not be explained by the existing theory.
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