Barium titanate ( BaTiO 3 ) thin films have been deposited on MgO substrates by pulsed-laser deposition under various deposition conditions. The films were characterized as highly oriented polycrystalline based on X-ray diffraction analysis, atomic force microscope observation and the angular dependence of the optical second-harmonic generation (SHG). The second-order nonlinear optical coefficients ( d -coefficients) of one-eighth those of the bulk BaTiO 3 crystal were obtained from as-grown films.
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Okada et al. (1995) studied this question.
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