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The three thermo-optic coefficients of the biaxial laser host KLu(WO4)2 are measured at 633 nm by a deflection method and nearly athermal propagation directions are found for polarizations along the Nm and Np principal axes.
Nonlinear index was investigated in undoped and Yb-doped monoclinic double-tungstates for EparNm and EparNp polarized 819 nm light. Anisotropic n2 with maximum for EparNm in all investigated compounds is proportional to the rare earth ion polarizability.
Single-pass pumping of a thin disk consisting of a 50 mum epitaxial layer of 32% Yb-doped KLu(WO4)2 deposited on a KLu(WO4)2 substrate produced 9 W of output power near 1030 nm at 77% slope efficiency.
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