Abstract
Abstract Effects of crystal orientation which gives rise to parallel and cross polarization coupling have been investigated in degenerate four-wave mixing in absorbing semi-insulating compound semiconductor photorefractive crystals in transmission geometry. The dependence of cross and parallel polarization coupling, and phase conjugate beam of particular polarization, on crystal rotation has been investigated. Considering the pump beam depletion, nonlinear coupled wave equations are obtained and have been solved numerically by a shooting method. The presence of parallel coupling suppresses the cross coupling effect to a large extent and vice versa. Numerical results obtained from computer calculations are presented in graphical form.
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