Abstract

Photorefractive materials can be used in a wide range of applications in optical signal processing such as optical interconnections, novelty filters, real-time holography, etc. Since the first observation of the spatial subharmonics by Mallick et al.¹ in photorefractive Bi₁₂SiO₂₀ crystal in 1988, there have been further intensive works on this new phenomena in both theory and experiments.² However, most of the work in this field has been concentrated on obtaining the instability condition for the generation of subharmonics. We start with a nonlinear partial differential equation for the varying part of the space charge field E_sc in a moving co-ordinate (ξ = Kx − Ωt) system.²

© 1995 IEEE