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：The Tm 3+ /Yb 3+ co-doped germanate-tellurite glasses with good thermal properties were prepared. Based on the absorption spectra and the Judd-Ofelt theory, the J-O intensity parameters (Ωt), radiative transition probability (276.78s -1 ), fluorescence lifetime (3.89ms) and absorption and emission cross sections ( e  =1.35×10 -20 cm 2 ) were calculated. The ~2μm mid-infrared emission resulting from the 3 F4→ 3 H6 transition of Tm 3+ sensitized by Yb 3+ has been observed pumped by 980nm LD.Besides, the energy transfer mechanism between Yb 3+ and Tm 3+ was thoroughly discussed. Meanwhile, the measured ~2μm emission lifetime of Tm 3+ /Yb 3+ co-doped glass can reach as high as 2.38ms. The above results showed that Tm 3+ /Yb 3+ A c c e p t e d m a n u s c r i p t 2 co-doping glass could be expected to be a promising material to achieve high efficient ~2μm lasing with a 980nm LD pumping.

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