Abstract

We studied the refractive index and dispersive properties of the tetragonal rare-earth calcium aluminates, CaLnAlO4 (Ln=Gd or Y). Sellmeier equations were derived for the spectral range of 0.35–2.1 μm. The group velocity dispersion (GVD) in CaGdAlO4 is positive at 1μm, 95fs2/mm and negative at 2μm, 40fs2/mm. The GVD values for CaYAlO4 are similar. In addition, thermo-optic coefficients, dn/dT, and thermal coefficients of the optical path were determined for CaYAlO4. dn/dT is negative at 1μm, dno/dT=7.8, and dne/dT=8.7×106K1. Thermo-optic dispersion formulas were constructed. The obtained data are of key importance to the design of high-power mode-locked oscillators at 1 and 2μm based on such laser hosts.

© 2017 Optical Society of America

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