We propose and experimentally demonstrate a simple technique capable of significantly enhancing the signal-to-noise ratio of photorefractive amplifiers. The optical noise due to amplified scattered light and multiple interface reflections is removed by performing two-wave mixing in off-axis-rotating BaTiO3 and Bi12SiO20 crystals. A 20-fold improvement of the signal-to-noise ratio is achieved, and virtually noise-free image amplifiers are demonstrated.
© 1989 Optical Society of America
Original Manuscript: May 22, 1989
Manuscript Accepted: September 8, 1989
Published: November 15, 1989
H. Rajbenbach, A. Delboulbé, and J. P. Huignard, "Noise suppression in photorefractive image amplifiers," Opt. Lett. 14, 1275-1277 (1989)