Generation of Phase Conjugate Wave Using LiNbO3:Fe and Application to Optical Associative Memory

Experimental results are presented for a phase conjugate wave generation using an iron-doped lithium niobate single crystal by the degenerate four-wave mixing method. More than 300% reflection efficiency is achieved, and it is almost independent of the total incident optical intensity. The generator is then applied as a phase conjugate mirror to an all-optical associative holographic memory to reflect and amplify the diffracted beams. The retrieved output image is formed by using partial input illumination.