SELF-OSCILLATION IN A PHOTOREFRACTIVE PHASE-CONJUGATE MIRROR WITH LINEAR ABSORPTION .2. ANISOTROPIC 4-WAVE-MIXING

The effects of linear absorption on the degenerate and nondegenerate s elf-oscillation of a photorefractive phase-conjugate mirror under cond ition of anisotropic four-wave mixing are considered. Thf phase conjug ation results from nonlinear mixing of two strong undepleted orthogona lly polarized counterpropagating pump waves with a probe wave. We cons ider two types of situation for orthogonally polarized pump beams corr esponding to two crystal families: one such as the Bi12SiO20, crystal family (sillenite family) and the other such as the BaTiO3 and stronti um barium niobate crystal family. In both of these crystal families th e degenerate and nondegenerate self-oscillations are shown to occur in the presence of linear absorption, which tends to increase the value of the coupling coefficient required for self-oscillation. Numerical r esults are presented that exhibit various features of degenerate and n ondegenerate self-oscillation in both crystal families for different v alues of the phase phi(b) of the backward grating. (C) 1996 Optical So ciety of America.