Beam coupling in BaTiO3 at 442 nm

Abstract

Steady-state beam coupling is used to measure the concentration of empty traps, the sign of the dominant photocarrier, and the effective electro-optic coefficient in seven crystals of BaTiO3. The measured value of the effective electro-optic coefficient gives the product of the fractional poling of the crystal, the relative conductivity of the crystal, and the electro-optic coefficient. Anomalously low beam coupling gain measured in an eighth crystal suggests that this crystal is nearly perfectly compensated; i.e., the photoconductivities due to electrons and holes are nearly equal.