Beam coupling in BaTiO3 at 442 nm

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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.