Motoki SAITO,¹ Atsushi OKAMOTO,¹ Kunihiro SATO² and Yosihisa TAKAYAMA¹

¹Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido, 060 Japan, ²Faculty of Engineering, Hokkai-Gakuen University, Sapporo, Hokkaido, 064 Japan

(Received March 24, 1997; Accepted August 26, 1997)

Four wave mixing (FWM) is of considerable interest in generation of a phase conjugate beam with photorefractive crystals. The common methods of FWM are parallel polarization FWM and cross polarization FWM. In this paper, we analyze the phase matching property of the latter. First, we consider the phase matching condition, and derive equations representing the angler relationship of interacting beams. Then, we consider the phase mismatching which is caused by shift of the probe beam angle from the phase matching condition, and calculate the effect of the shift of this angle on the amount of phase mismatching. We also determine and closely examine the coupling constant.

Key words : photorefractive, cross polarization four wave mixing, phase matching, phase mismatching, coupling coefficient

*motoki@optnet.hudk.hokudai.ac.jp