Abstract
The temperature dependence of the photorefractive two-beam coupling gain coefficient, its time constant, and the optical absorption in semi-insulating undoped GaP were measured. It was observed that at low temperature the two-beam coupling gain coefficient was quenched and the optical absorption exhibited a dependence on intensity. A multiple defect model for GaP which has a shallow donor level and a shallow acceptor level in addition to the photorefractive deep donor was presented. These secondary traps contribute significantly to the photorefractive effect and the absorption at low temperature. The binding energies of the shallow donor and the shallow acceptor were estimated from the experiments to be 150 meV and 120 meV, respectively.
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