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

Abstract

We present a temperature-dependent Sellmeier equation for the refractive index of stoichiometric ${\mathrm{LiTaO}}_3$. The extraordinary refractive index, for the range $0.39–4.1 \mathit{\mu }\mathrm{m}$ and for temperatures of 30–200 °C, are based on previously published data [Jpn. J. Appl. Phys. 41, 465 (2002)] and on measured data derived from quasi-phase-matched (QPM) resonances. We used the new Sellmeier coefficients that we obtained to calculate the QPM wavelengths for an optical parametric oscillator (OPO) based on periodically poled stoichiometric ${\mathrm{LiTaO}}_3$ pumped at 1064 nm. The measured wavelengths of the OPO were in good agreement with our predictions.

© 2003 Optical Society of America

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