Core-clad Pr(3+)-doped Ga(In)GeAsSe glass fibers for Mid-IR radiation sources

Abstract Pr(3+)-doped Ga(In)GeAsSe glass fibers having the various core and clad glass compositions, the core/clad diameters ratio, and 500–2600 ppmw dopant concentrations, are prepared. Optical losses of fibers having 10–40 µm core diameters are 0.8–1.2 dB/m at wavelengths outside the range of the Pr(3+) absorption bands. Fibers manifest photoluminescence at 2.4 µm wavelength and a broadband intensive emission in the 3.5–6.0 µm spectral range For the first time, the core-clad fibers are fabricated from the 1300 ppmw Pr(3+)-doped Ga3Ge31As18Se48 glass, having higher glass transition temperature (356 °С) in comparison with previously prepared REE-doped GaGeAsSe glass fibers. These fibers withstand the 1.56 µm CW laser pump power up to 1.6 W. It is demonstrated for the 2.5 m length fiber samples.