Analysis Of The Energy Dependence Of The Photorefractive Gain In Nanosecond Wave Mixing In Semiconductor Crystals.

Based on the results of two wave-mixing experiments in the nanosecond regime conducted in the semi-insulating crystal InP:Fe we present an analysis of the build-up of the photoinduced space charge field that governs the photorefractive effect. A numerical integration of the material's differential equations is carried out taking into account charge transport by holes and electrons. Competition between drift and diffusion, and between hole and electron charge transport limits the coupling gain. The time evolution and the role of the important quantities are explained by the use of appropriate approximations.