We present a two-beam coupling configuration in photorefractive BaTiO3 that provides a low-noise amplification of the signal to be detected. A two-wave mixing gain of 100 is reached, in conjunction with very low beam fanning background in the signal direction. The extensions of this configuration to photorefractive heterodyne detection and to multistage image amplif ication are theoretically and experimentally studied.
© 1995 Optical Society of America
S. Breugnot, H. Rajbenbach, M. Defour, and J.-P. Huignard, "Low-noise preamplifier for multistage photorefractive image amplification," Opt. Lett. 20, 1568-1570 (1995)