Critical enhancement of photorefractive beam coupling
We show that a hybridization of the optical and material nonlinearities takes place near the threshold of the subharmonic generation in photorefractive crystals. It results in a critical (with a singularity) enhancement of the rate of spatial amplification of light waves and leads to a variety of new optical critical phenomena.
Podivilov
EV
International Institute for Nonlinear Studies, Koptyug Prospect 1, 630090, Novosibirsk, Russia.
Sturman
BI
Pedersen
HC
Johansen
PM