Hu, Z.W., Thomas, P.A. and Webjörn, J.
High resolution x-ray characterization of periodically domain-inverted nonlinear optical crystals
Journal of Physics D: Applied Physics, 28, (4A), . (doi:10.1088/0022-3727/28/4A/037).
A high-resolution triple-axis diffractometer has been used for the structural characterization of periodically domain-inverted nonlinear optical crystals of KTiOPO4 and LNbO3. Striations have been revealed in high strain-sensitivity multiple-crystal topographs of the domain-inverted regions of both these samples and these are dominated by orientation contrast. The combination of high-resolution reciprocal-space mapping and topography has shown that the extended diffraction streak in the q direction for domain-inverted LiNbO3 originates from the "minutely misoriented structure" which is related to the original configuration of dislocations. The reason for the generation of the structural imperfections via the domain-inversion processing is interpreted in terms of the converse piezoelectric effect.
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