Transient two-wave mixing of photorefractiveBi₁₂SiO₂₀ crystal with a square a.c. electricfield

摘要

Two wave mixing (TWM) gain in photorefractive materials is one ofnthe most fundamental and attractive aspects of the photorefractiveneffect. Several techniques for the enhancement of TWM gain have beenndeveloped and analysed by many researchers. In this paper we developednthe corresponding theory describing the buildup of the space-chargenfield in the presence of square a.c. field and compared with thenexperimental results of the full temporal variation of the TWM gain fornthe square applied fields in a photorefractive Bi₁₂SiO_20n crystal