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The use of Yb 3+  and Er 3+  co-doping with Ho 3+  to enhance and broaden the Ho 3+ :  5 I 6  →  5 I 7  ~2.8 μm emissions are investigated in the fluorotellurite-germanate glasses. An intense ~3 μm emission with a full width at half maximum (FWHM) of 245 nm is achieved in the Er 3+ /Ho 3+ /Yb 3+  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 Ho 3+ :  5 I 6  level is as high as 0.218 ms. In addition, the energy transfer rate to hydroxyl groups and quantum efficiency ( η ) of  5 I 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 GeO 2  into fluorotellurite glasses. Results reveal that Er 3+ /Ho 3+ /Yb 3+  triply-doped fluorotellurite-germanate glass is a potential kind of laser glass for efficient 3 μm laser.

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