Abstract
We measured the unclamped electro-optic coefficients and of near-stoichiometric and congruent lithium tantalate from down to the absorption edge at . Electro-optical coefficients up to have been determined at . The reduced half-wave voltage at is for and for the configuration employing . We propose a two-oscillator polarization potential model that well describes our data in the UV. In the investigated wavelength range the values for stoichiometric and congruent differ by less than 3%, which is below the accuracy of our measurements. In addition, the refractive indices in the UV were measured, and more precise Sellmeier parameters for the UV and visible were determined based on the previous and new refractive-index data.
© 2006 Optical Society of America
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