Abstract

The large electro-optic coefficient of photorefractive materials such as BaTiO₃ has allowed the observation of exotic phase conjugators such as the Self-Pumped Phase Conjugator (SPPC)¹ and, more recently, the Mutually Pumped Phase Conjugator (MPPC), in which two simultaneous phase conjugate (PC) outputs are produced by the interaction of two mutually incoherent beams within a photorefractive crystal. Several generic MPPC configurations have been reported, differing more in their exact beam geometry rather than the physical mechanism responsible for the effect. These geometries include the Double Phase Conjugate Mirror (DPCM)², the Mutually incoherent beam coupler (MIBC)³, the Bird-Wing Phase Conjugator (BWPC)⁴, the Frogs Legs Conjugator³ and the Bridge Conjugator^6,7. Both the DPCM and MIBC have been shown to possess input beam intensity ratio dependent reflectivities and threshold^8,9, and these properties have been utilised in the DPCM for image processing applications⁸.

© 1991 Optical Society of America