title: Critical enhancement of photorefractive beam coupling
abstract: 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.
authors.affiliation: International Institute for Nonlinear Studies, Koptyug Prospect 1, 630090, Novosibirsk, Russia.
authors.initials: EV
authors.lastname: Podivilov
authors.initials: BI
authors.lastname: Sturman
authors.initials: HC
authors.lastname: Pedersen
authors.initials: PM
authors.lastname: Johansen