Apolinar-Iribe A, Korneev N, Sánchez-Mondragón J J
Opt Lett. 1998 Dec 15;23(24):1877-9. doi: 10.1364/ol.23.001877.
Two-wave mixing with a small angle between beams in a photorefractive crystal biased with an external electric field leads to the formation of additional non-Bragg orders and to wave amplification. A steady-state gain of 25 cm (-1) was obtained for an external voltage of 3 kV/cm in strontium barium niobate. Noise amplification and oscillation are also demonstrated.
