We show that the relative phase of the grating components has a large effect on the temporal behavior of four-wave mixing. When the two main components of the grating are in phase, the temporal behavior, especially during grating erasure, is totally different from that when the two components are out of phase. We give experimental results of orthogonally polarized four-wave mixing for two different BaTiO<sub>3</sub> crystals that are in good agreement with our theoretical calculations. In our calculations we use a simplified numerical method to solve the coupled-wave equations, and the temporal analysis is based on a model with multiple charge recombination.
© 2001 Optical Society of America
(160.5320) Materials : Photorefractive materials
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5040) Nonlinear optics : Phase conjugation
(190.5330) Nonlinear optics : Photorefractive optics
Imtiaz Ahmad Taj, Ping Xie, and Teruhito Mishima, "Effect of the relative phase of grating components on the temporal behavior of photorefractive four-wave mixing," J. Opt. Soc. Am. B 18, 1490-1496 (2001)