Abstract

We propose corrections to the coefficients in the published Sellmeier equation for stoichiometric ${\mathrm{LiTaO}}_3$ [Opt. Lett. 28, 194 (2003) ] that allow the extension of the wavelength range within the region of midinfrared absorption edge up to $6\mathrm{\mu }\mathrm{m}$. The required extraordinary refractive index data for this range were obtained using single-pass optical parametric fluorescence measurements with a pump wavelength of $1064.4\mathrm{nm}$. We also observed efficient parasitic second-harmonic generation that could affect some quasi-phase-matching interactions. The corrected Sellmeier equation improves the accuracy of poling period calculations where the idler wavelength is within the region.

© 2006 Optical Society of America

Temperature-dependent Sellmeier equation for the refractive index of stoichiometric lithium tantalate

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