Abstract
The most popular photorefractive material BaTiO 3 suffers from a crippling defect when applications are considered: its phase transition around room temperature that can destroy its photorefractive characteristics, if not the crystal itself. Some years ago, University of Osnabrück [1] , proposed and successfully grew Ba 0.77 Ca 0.23 TiO 3 an alloy derived from BaTiO 3 , in which the phase transition was pushed away towards low temperature. The remaining question was then: does this new material keep the good photorefractive properties that made the success of BaTiO 3 ? We will present here some theoretical and experimental results that allow us to answer this question and that show that despite some differences in the photorefractive properties between BaTiO 3 and BCT, the new crystal is an extremely promising materials for photorefractive applications, such as phase conjugation or dynamic holographic intracavity laser mode selection.
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