title: Corrections to refractive index data of stoichiometric lithium tantalate in the 5-6 microm range.
abstract: We propose corrections to the coefficients in the published Sellmeier equation for stoichiometric LiTaO3 [Opt. Lett.28, 194 (2003)] that allow the extension of the wavelength range within the region of midinfrared absorption edge up to 6 microm. 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 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.
authors.affiliation: Laser Physics Centre, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia. vesselin.kolev@anu.edu.au
authors.forename: V Z
authors.initials: VZ
authors.lastname: Kolev
authors.forename: M W
authors.initials: MW
authors.lastname: Duering
authors.forename: B
authors.initials: B
authors.lastname: Luther-Davies