per unit length and E the interaction length. According to the sign in eq. (2) the energy transfer is positive or negative.'
U. CHARGE TRANSPORT AND BEAM COUPLING GAINInterference of pump and probe beam produces the illumination gratingBased 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.
Energy transfer between two nanosecond light pulses interacting in semi-insulating a3m crystals is studied. By using the specific dependences of the photorefractive effect on wave polarizations and crystal orientation, the contribution of this to two-wave mixing in GaAs and InP is analyzed.
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