Abstract

We report on the first holmium (${\mathrm{Ho}}^{3+}$) monoclinic double tungstate thin-disk laser. It is based on a 250 μm thick 3 at. % $\mathrm{Ho}\text{:}\mathrm{KY}{({\mathrm{WO}}_4)}_2$ active layer grown on a (010)-oriented $\mathrm{KY}{({\mathrm{WO}}_4)}_2$ substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce (single double-pass) pump geometry, the CW $\mathrm{Ho}\text{:}\mathrm{KY}{({\mathrm{WO}}_4)}_2$ thin-disk laser generated 1.01 W at 2057 nm, corresponding to a slope efficiency $\eta$ of 60% and a laser threshold of only 0.15 W. Implementing a double-bounce (second double-pass) for the pump, the output of this laser was scaled to 1.57 W with $\eta =55\%$. The maximum stimulated emission cross section ${\sigma }_{\mathrm{SE}}$ of the ${\mathrm{Ho}}^{3+}$ ions in the epitaxial layer reaches $2.5\times {10}^{-20}{\mathrm{cm}}^2$ at 2056.5 nm for $E\Vert N_m$. The $\mathrm{Ho}\text{:}\mathrm{KY}{({\mathrm{WO}}_4)}_2$ epitaxial structures are promising for multi-watt mode-locked thin-disk lasers at $\sim 2.06\mathrm{\mu m}$.

© 2017 Optical Society of America

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