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Abstract: 0.2wt% Dy3+ doped and 0.2wt% Dy3+/0.5wt% Tm3+ co-doped novel GeS2–Ga2S3–PbS–CsI chalcohalide glasses were prepared and their spectroscopic properties were analyzed based on absorption (ranges from 300 to 3000nm) and emission (ranges from 1000 to 4700nm) measurements. Judd–Ofelt analyses were performed to estimate radiative transition parameters for the excited levels. Compositional dependences of near- and mid-infrared luminescences (especially the 1330, 2930 and 4320nm) excited at 808nm were investigated and discussed. These novel chalcohalide glasses may have potential uses in 1.3μm fiber-amplifiers and 2.9 or 4.3μm mid-infrared laser devices. [Copyright &y& Elsevier]

Highlights: [•] The properties of Ge–Ga–S–AgI glass with rare earth ions have been reported. [•] We examine quality changes in the glasses with different level of ions content. [•] Strong 4300nm emission is found in the Dy3+/Tm3+ codoped glass. [Copyright &y& Elsevier]

For elucidation of the glass composition’s influence on the spectroscopic properties in the chalcohalide system and the discovery of a new material for applications in mid-infrared fiber-lasers, a serial Pr 3+ -doped (100 − x )(0.8GeS 2 ·0.2Ga 2 S 3 ) x CdI 2 ( x = 5, 10, 15 and 20) chalcohalide glasses were prepared. ∼4.6 μm mid-infrared fluorescence emission from Pr 3+ in the sulfide glass is successfully observed at room temperature excited by a 2.01 μm Tm 3+ :YAG ceramic laser system, and the effective line-width of fluorescence band is 106–227 nm. Intense compositional dependence of mid-infrared emissions is found. The radiative rates of Pr 3+ ions in these glasses were calculated by using the Judd–Ofelt theory. [ABSTRACT FROM AUTHOR]

Yb3+/Ho3+ codoped and Yb3+/Er3+/Ho3+ tridoped TeO 2 –BaF 2 –LaF 3 –La 2 O 3 (TBLL) fluorotellurite glasses with low OH− absorption (0.026 cm-1), high glass transition temperature (434 °C) and low phonon energy (784 cm-1) were prepared. Their mid-infrared fluorescence properties and related energy transfer (ET) mechanism were studied under 980 nm excitation. A strong emission at 2.85 μm was realized in Yb3+/Ho3+ codoped tellurite glass, which was attributed to the high-efficiency ET from Yb3+ ions to Ho3+, and the ET efficiency was 91.1%. Further introduction of Er3+ ions induced stronger 2.85 μm emission, and the ET efficiency was improved to 96.2%, ascribed to the establishment of more ET channels and Er3+ ions playing the role of ET bridge between Yb3+ and Ho3+ ions. These results indicate that the Yb3+/Er3+/Ho3+ tridoped tellurite glass could be a hopeful gain medium material for the ∼3 μm fiber laser. [ABSTRACT FROM AUTHOR]

0.2%–3% weight of Dy 3+ ions doped 64GeS 2 ·16Ga 2 S 3 ·20CdI 2 glasses were synthesized, and their spectroscopic properties were investigated. It was shown that the host glass could dissolve as much as 3% Dy 3+ ions without deteriorating the glass transparency. The mid-infrared (MIR) emissions of the glasses did not present remarkable concentration quenching when the Dy 3+ ions concentration was less than 0.6%. It was also shown that the MIR emission properties could be significantly improved by reducing S H/O H impurities in the glasses. The spectral analyses indicated that the 2.9 and 4.3 μm emissions of Dy 3+ ions in the glass showed relatively large stimulated emission cross sections. The glass doped with as high as 0.4% Dy 3+ ions was successfully drawn into fibers, indicating good potential of the doped glass for MIR lasers. [ABSTRACT FROM AUTHOR]