Abstract

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 amplification are theoretically and experimentally studied.

© 1995 Optical Society of America

Low-noise photorefractive amplification and detection of very weak signal beams

S. Breugnot, H. Rajbenbach, M. Defour, and J.-P. Huignard
Opt. Lett. 20(5) 447-449 (1995)

Enhancement of the signal-to-background ratio in photorefractive two-wave mixing by mutually incoherent two-beam coupling

S. Breugnot, D. Dolfi, H. Rajbenbach, J.-P. Huignard, and M. Defour
Opt. Lett. 19(14) 1070-1072 (1994)

High-gain, low-noise signal beam amplification in photorefractive BaTiO₃

Joby Joseph, P. K. C. Pillai, and Kehar Singh
Appl. Opt. 30(23) 3315-3318 (1991)

Low-noise amplification of ultraweak optical wave fronts in photorefractive Bi₁₂SiO₂₀

Henri Rajbenbach, Anne Delboulbé, and Jean-Pierre Huignard
Opt. Lett. 16(19) 1481-1483 (1991)

Noise in χ⁽³⁾ and photorefractive amplifiers

Shmuel Sternklar and Yaakov Glick
Opt. Lett. 20(23) 2369-2371 (1995)