Nc. Kothari, SELF-OSCILLATION IN A PHOTOREFRACTIVE PHASE-CONJUGATE MIRROR WITH LINEAR ABSORPTION .2. ANISOTROPIC 4-WAVE-MIXING, Journal of the Optical Society of America. B, Optical physics, 13(10), 1996, pp. 2320-2325
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.