Abstract
The refractive indices and quadratic electro-optic effect in terms of the coefficients () in a paraelectric single crystal were measured. The dispersion of the refractive index was described exactly by a single-term Sellmeier equation. We found an obvious dispersion of the electro-optic coefficients (), and the coefficients decreased quickly with increasing wavelength above the Curie temperature. Following [J. Appl. Phys. 40, 720 (1969)], we obtained a dispersion equation for the electro-optic effect in a paraelectric potassium sodium tantalate niobate single crystal. The experimental results agreed well with the dispersion model.
© 2013 Optical Society of America
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