Abstract
We report a new Dy3+-doped Ga2S3-Sb2S3-La2S3 (GSLS) chalcogenide glass for mid-infrared (mid-IR) laser applications. With the addition of La2S3 into the previously studied Ga2S3-Sb2S3 glass, the thermal stability of the base glass is significantly enhanced. The glass with the composition 20Ga2S3-75Sb2S3-5La2S3 (mol.%) shows the best thermal stability for fiber drawing, and the glass can be doped with up to 5 mol.% Dy2S3. The Dy3+-doped GSLS bulk glasses and a multimode fiber exhibit intense emissions at 2.95 μm and 4.40 μm. Spectroscopic analyses show that the mid-IR emissions are with high quantum efficiencies and large stimulated emission cross sections, indicating that Dy3+-doped GSLS glass is a promising candidate for mid-IR fiber laser medium.
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