Abstract

The double phase conjugate mirror (DPCM) couples two incoherent beams and has been demonstrated in a variety of materials and geometries.^1-5 It has applications in optical processing, laser phase locking and optical neural networks. Two phase conjugate outputs are produced simultaneously in the interaction of the two mutually incoherent laser beams within the photorefractive crystal by four-wave mixing (FWM). The DPCMs reported to date can be categorised by the number of internal reflections the beams experience before emerging; zero (double phase conjugation and modified bridge)^1,2 one (bird-wing),³ two (mutually incoherent beam coupling; MIPC)⁴ and three (frog-legs).⁵

© 1995 IEEE