NONLINEAR-OPTICAL AND ELECTROOPTICAL PROPERTIES OF SINGLE-CRYSTAL CSTIOASO4

We report the development of a new nonlinear optical crystal CsTiOAsO4 (CTA). The relatively large cesium ion leads to a structural instabil ity in the orthorhombic structure, which significantly affects its cry stal growth properties. Modification of the crystal growth process, ho wever, allows the growth of large inclusion-free single crystals measu ring up to 30 X 20 X 25 mm3. The refractive indices, nonlinear optical coefficients, electro-optic coefficients, and dielectric properties o f these crystals were measured using standard techniques. Compared to KTiOPO4, CTA has a smaller birefringence which makes it particularly s uitable for frequency doubling Nd:YAG lasers operating near 1.32 mum. We also report the ferroelectric poling of multidomain CTA crystals an d discuss possible extension of this poling process to other KTP isomo rphs.