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The photorefractive (PR) degenerate four‐wave mixing (DFWM) of polarized electromagnetic waves in cubic isotropic crystals is considered. Effects of cross‐polarization coupling have been investigated in the case of DFWM in absorbing, semi‐insulating compound semiconductor PR crystals in reflection geometry. Considering the pump beam depletion, nonlinear coupled wave equations are obtained and have been solved numerically by a shooting method. Numerical results obtained from computer calculations are presented in graphical form. It is observed that the intensity of a particular polarization component can be appreciably increased by a proper choice of input beam polarization angle, crystal orientation, and crystal thickness.