Abstract
Ba0.77Ca0.23TiO3 (BCT) crystals have interesting photorefractive and electrooptic properties, as was recently demonstrated in several papers. Analysing these results and our own experiments, we have come to the conclusion that there is an effective bulk electric field inside the crystal. In order to estimate the value of the suggested field inside the crystal we have developed an experimental method based on two-and four-wave mixing presented in this paper, where we use a BCT crystal grown by Kuper and co-workers from the University of Osnabruck. Knowing the value of the bulk field we have estimated the value of the effective photoconductivity of the crystal.
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