Abstract
Over the past several years a new field of interest has emerged in coherent optics: non linear optical phase conjugation. That field include the possibility of performing operations in real time on the phase and amplitude of optical wavefronts. The use of such non linear interactions has resulted in numerous new applications such as adaptive optics, image transmission and amplification and non linear spectroscopy. In this paper we present at first the principle of phase conjugate mirrors and the rest of the lecture is devoted to applications of wave mixing experiments in photorefractive crystals. We will present the physical processes responsible of the index change and the application of phase conjugate wavefront generation to real time optical processing, dynamic holography and interferometry.
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