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The Sm 3+ -doped low-phonon-energy (LPE) Ge–Ga–Se–CsI glasses were studied. Upon excitation at 980nm diode laser, intense 1.25 and 1.49μm near-infrared fluorescence bands with broad full width at half maximum (FWHM) of 49 and 53nm were observed, respectively. About 180–300μs fluorescence lifetimes were obtained for the 1.49μm emission. The thermal properties and structure of glasses were investigated...
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