Abstract

We report on the composition of Er-doped $\mathrm{KG}{\mathrm{d}}_x{\mathrm{Yb}}_y{\mathrm{Y}}_{1-x-y}{({\mathrm{WO}}_4)}_2$ layers to be grown onto undoped $\mathrm{KY}{({\mathrm{WO}}_4)}_2$ substrate providing fine lattice matching and high refractive index contrast with the substrate and fabrication of high optical quality $\mathrm{Er}(1.3\text{at.}\%)\text{:}\mathrm{KG}{\mathrm{d}}_{0.2}{\mathrm{Yb}}_{0.15}{\mathrm{Y}}_{0.65}{({\mathrm{WO}}_4)}_2$ epitaxial layers with thickness up to 180 μm. Absorption and luminescence properties of the layer were measured and laser action under direct in-band pumping was reported for the first time, to our knowledge, in a non-waveguide configuration. A maximum output power of 16 mW with slope efficiency of 64% was achieved at 1606 nm.

© 2017 Optical Society of America

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