2.8 mu m emission and OH quenching analysis in Ho3+ doped fluorotellurite-germanate glasses sensitized by Yb3+ and Er3+

Abstract : The use of Yb3+ and Er3+ co-doping with Ho3+ to enhance and broaden the Ho3+:I-5(6) -> I-5(7) similar to 2.8 mu m emissions are investigated in the fluorotellurite-germanate glasses. An intense similar to 3 mu m emission with a full width at half maximum (FWHM) of 245 nm is achieved in the Er3+/Ho3+/Yb3+ triply-doped fluorotellurite-germanate glass upon excitation at 980 nm. The glass not only possesses considerably low OH-absorption coefficient (0.189 cm(-1)), but also exhibits low phonon energy (704 cm(-1)). Moreover, the measured lifetime of Ho3+:I-5(6) level is as high as 0.218 ms. In addition, the energy transfer rate to hydroxyl groups and quantum efficiency (eta) of I-5(6) level were calculated in detail by fitting the variations of lifetimes vs. the OH- concentrations. The formation ability and thermal stability of glasses have been improved by introducing GeO2 into fluorotellurite glasses. Results reveal that Er3+/Ho3+/Yb3+ triply-doped fluorotellurite-germanate glass is a potential kind of laser glass for efficient 3 mu m laser.
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Junjie Zhang, Yu Lu, Muzhi Cai, Ying Tian, Feifei Huang, et al.. 2.8 mu m emission and OH quenching analysis in Ho3+ doped fluorotellurite-germanate glasses sensitized by Yb3+ and Er3+. Scientific Reports, Nature Publishing Group, 2017, 7 (1), pp.16794 ⟨10.1038/s41598-017-16937-7⟩. ⟨hal-01671259⟩

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