Abstract
The paper describes a chalcogenide glass fiber laser operating at the wavelength inaccessible to oxide and fluoride rare-earth doped fibers. The lasing fiber had 19 μm diam. selenide core doped with 2 × 1019 cm−3 of Tb3+ ions and 270 μm diam. undoped sulfide cladding. The pump source was a CW 1.98 µm Tm3+ fiber laser. Up to 36 mW TEM00 output was obtained in the 5.20–5.28 µm spectral band.
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