CROSS-POLARIZED PHOTOREFRACTIVE 4-WAVE-MIXING WITH EXTRAORDINARY WRITING BEAMS AND AN ORDINARY READING BEAM

In parallel-polarized photorefractive four-wave mixing the phase-match ing condition can be achieved automatically if the pump beams are allo wed to propagate in directions opposite to each other. However, in cro ss-polarized photorefractive four-wave mixing, the incident angles of the beams should be adjusted to maintain the phase-matching condition. We analyze the phase-matching properties of cross-polarized four-wave mixing with extraordinary writing beams and an ordinary reading beam and obtain the phase-conjugate reflectivity in consideration of phase mismatching. We also perform an experiment in which a phase-conjugate beam is generated in cross-polarized four-wave mixing and confirm the analyses. (C) 1998 Optical Society of America.