Generation of Two Self-Pumped Phase-Conjugated Waves at Different Wavelengths Using Single Photorefractive Crystal

Abstract

Two self-pumped phase-conjugated waves at different wavelengths are successfully generated using an undoped barium titanate crystal. With one signal beam at a wavelength of 514.5 nm incident to the (100) face of the crystal and the other at a wavelength of 488.0 nm incident to the opposite (100) face with an offset of 2 mm, two phase-conjugated images are produced even at high power ratios between the signal beams. The use of two different wavelengths prevents interference between the two signal beams, resulting in the generation of phase-conjugated waves over a wide dynamic range.