holographic storage in electrooptic crystals. II. beam coupling—light amplification

Abstract

The theory of energy transfer between two coupled beams writing holograms in electrooptic crystals is developed. The gain is calculated for different processes causing holographic recording in the crystal.The amplifications of the light beam in the course of recording holograms in nominally pure reduced LiNbO3 crystals is investigated. The amplification of about 10 cm''-1 is obtained for small signals. The gain is found to be independent of the total light intensity and intensity ratio of the writing beams and decreases linearly with the grating spacing.