Two-wave mixing and light-induced absorption dynamics in photorefractive BaTiO3 crystals

Abstract

Steady-state and temporal measurements of TWM and LIA have been carried out in PR BaTiO3 crystals at different wavelengths and intensities of laser light. The observed behavior is interpreted in terms of two-center charge transport model for PR materials. The rate equations were solved to derive an analytical expression for steady-state absorption changes. Various model parameters like build-up and decay rates, thermal excitation rates, and two-wave coupling gain have been obtained and compared with the earlier studies.