In a previous report we discussed the potential for two non-hygroscopic solid-state crystals as new hosts for Dy3+ lasers in the mid-IR (2-10µm) at room temperature. In this paper, we report such laser action at 2.43 and 4.31 µm in CaGa2S4:Dy3+, and at 2.43 µm in KPb2Cl5:Dy3+. Slope efficiencies of 2.7% and 1.6%, respectively, were achieved for the sulfide crystal and 2.2% for the chloride crystal. Findlay-Clay analysis obtained losses of 3.9%, 0.9%, and 1.2%, respectively.

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