Abstract
We report on the first holmium (Ho3+) monoclinic double tungstate thin-disk laser. It is based on a 250μm thick 3at.% Ho:KY(WO4)2 active layer grown on a (010)-oriented KY(WO4)2 substrate. When pumped by a Tm-fiber laser at 1960nm with a single-bounce (single double-pass) pump geometry, the CW Ho:KY(WO4)2 thin-disk laser generated 1.01W at 2057nm, corresponding to a slope efficiency η of 60% and a laser threshold of only 0.15W. Implementing a double-bounce (second double-pass) for the pump, the output of this laser was scaled to 1.57W with η=55%. The maximum stimulated emission cross section σSE of the Ho3+ ions in the epitaxial layer reaches 2.5×10-20 cm2 at 2056.5nm for E‖Nm. The Ho:KY(WO4)2 epitaxial structures are promising for multi-watt mode-locked thin-disk lasers at ∼2.06 μm.
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