We present an analytical approximative solution of four-wave mixing in photorefractive crystals with depleted pumps for the case of a negative coupling coefficient and then discuss the solution.
© 1989 Optical Society of America
J. Goltz and T. Tschudi, "Four-wave mixing in photorefractive crystals with depleted pumps: an analytical treatment," Opt. Lett. 14, 405-407 (1989)