Beam-coupling topography is a new holographic technique for spatially resolved studies of induced and spontaneous polarization in photorefractive crystals. It is especially suited for mapping 180°-domains. In this paper theoretical and experimental fundamentals of the method are outlined. Some results on Ba 0.29 Sr 0.71 Nb 2 O 6 :Ce are given.
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Kahmann et al. (1990) studied this question.
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