Model for resonant intensity dependence of photorefractive two-wave mixing in InP:Fe

Abstract
We present a new model, which incorporates both temperature and electron–hole effects, for two-beam coupling in photorefractive semiconductors under an external dc field E0. We show that the exponential gain Γ exhibits an intensity-dependent resonance. The application of this model to InP:Fe allows us to predict a value of Γ near 20 cm−1 for a thin sample at 1.06 μm with E0 = 10 kV/cm.