Abstract
We present a demonstration of the influence of the indirect electro-optic effect on the photorefractive performance of Ba0.77Ca0.23TiO3 (BCT). The comparison of the orientation dependence of the two-beam coupling energy transfer gain with theoretical model allows us to obtain information on the electro-optic coefficients, but also an evaluation of the unknown elasto-optic, piezoelectric, and elastic stiffness coefficients of BCT. We found r13T=33 pm V−1 and r33T=170 pm V−1. These values are in good agreement with other published values. For the interesting coefficient r42T, we find a higher value r42T=465 pm V−1 than the one previously published. From this study we also determine that as in the case of BaTiO3, the optimal orientation is given by a 45°-cut BCT.
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