We report on the first holmium (Ho) monoclinic double tungstate thin-disk laser. It is based on a 250 μm thick 3 at. % Ho:KY(WO) active layer grown on a (010)-oriented KY(WO) substrate. When pumped by a Tm-fiber laser at 1960 nm with a single-bounce (single double-pass) pump geometry, the CW Ho:KY(WO) thin-disk laser generated 1.01 W at 2057 nm, corresponding to a slope efficiency η 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 η=55%. The maximum stimulated emission cross section σ of the Ho ions in the epitaxial layer reaches 2.5×10 cm at 2056.5 nm for E‖N. The Ho:KY(WO) epitaxial structures are promising for multi-watt mode-locked thin-disk lasers at ∼2.06 μm.
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