We propose a method for precise measurement of the
temperature-dependent refractive-index change in BaTiO3 by
use of anisotropic self-diffraction (ASD). In this method the
refractive-index change corresponds to the angle deviation of the
diffraction pattern. Because only the geometry of the ASD is used
for measuring, the precision of measurement is independent of crystal
thickness and environmental perturbation. The accuracy of the
refractive-index change achieved is 10-4 when the
resolution of the measurement of the angle is ∼0.04°. Both the
theory and the experiment are demonstrated.
© 2001 Optical Society of America
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