Temperature-Dependent Dispersion Equations for KTiOPO4 and KTiOAsO4

We have measured the thermal expansion and the temperature dependence of z and y components of the refractive index for KTiOPO4 and KTiOAsO4 , in the wavelength range 532-1585 nm and temperature range 25-200 (degree)C, using an interferometric technique. The measurements were used to derive temperature-dependent Sellmeier equations for the two materials. These equations predict with good agreement the temperature dependence of quasi-phase-matched nonlinear frequency converters.