We present an image-transmitting optical feedback system containing a phase-conjugating mirror (PCM) as an amplifying element. The PCM is based on four-wave mixing in a photorefractive BaTiO<sub>3</sub> crystal. The ring structure constitutes a new phase-conjugate-resonator configuration with the use of the aberration-compensating properties of the phase-conjugating element. Injection of a spatially modulated beam into this active feedback system causes image-bearing oscillation. Experimental results concerning image transmission and self-oscillation are reported.
© 1988 Optical Society of America
H. Klumb, A. Herden, T. Kobialka, F. Laeri, T. Tschudi, and J. Albers, "Active coherent optical feedback system with phase-conjugating image amplifier," J. Opt. Soc. Am. B 5, 2379-2385 (1988)