Abstract

Forward phase-conjugate wave in four wave mixing in photorefractive crystal LiNbO₃: Fe was studied. The experimental setup used here is that both pump beams I₁ and I₂ are perpendicular to the surface of the crystal (i.e. I₁ and I₂ beams are perpendicular to c-axes of the crystal), the incident angle θ of signal beam I₄ is varied from 10° ~ 40°. Both the forward and the backward phase conjugate image were observed at same time. The intensity of forward phase conjugate wave I_pf is comparable to the intensity of backward phase conjugate wave I_pb. For pump beam intensity I₁ = I₂ and θ = 30°, the intensity ratio of ^J 1 2 forward phase conjugate wave and backward phase conjugate wave I_pf/I_pb = 0.37 while the phase conjugate reflectivity R_ph = 1.36.

© 1991 Optical Society of America