The 82GeO2-8AlF3-10Na2O(molar ratio) glasses containing Tm2O3 in 1,2,3,4,and 5 wt% concentration,respectively were fabricated by conventional high temperature melting method.According to the Judd-Ofelt(J-O) theory,the JO strength parameters(Ω2,Ω4,Ω6) of Tm3+,the radiative transition probabilities,the branching ratios and the radiative lifetimes were calculated.The fluorescence spectra(with 808 nm LD excitation) at ～1.47 and ～1.8 μm for various concentrations of Tm3+-doped glasses were observed.T...