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Enhanced mid-infrared emission of erbium-doped fluoro-bromozirconate glass

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Abstract

A series of erbium-doped fluoro-bromozirconate glasses modified by various concentrations of Br was prepared using the melt-quenching method. The mid-infrared fluorescence intensity (2.7 μm) was improved by increasing the content of Br. The differential scanning calorimetry, x-ray diffraction, Fourier-transform infrared spectra, Raman spectra, and mid-infrared luminescence spectra were measured. The decreased phonon density shows that the structural changes due to inserting Br can enhance the mid-infrared luminescent intensity. From the Judd–Ofelt analysis, it was found that the intensity of Ω2 was enhanced with the introduction of Br and shows greater asymmetry and stronger covalency. Using the Fuchtbauer–Ladenburg theory and McCumber theory, the emission cross section (2.9×1020cm2) and absorption cross section (1.68×1020cm2) at 2.7 μm were determined. Hence, erbium-doped fluoro-bromozirconate glass is a potential material for application in the mid-infrared region.

© 2018 Optical Society of America

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