Abstract
In this paper, 80GeO2-8Ga2O3-10BaO-2Nb2O5-6PbO (in mol%) glass samples with different Tm2O3 concentrations (0, 0.5, 0.75, 1, 1.25, and 1.5 mol. %) were prepared by traditional melt-quenching method. According to the measurement of thermal properties of the host glass, the glass transition temperature is 596.7 °C and no crystallization peak is observed. Judd–Ofelt parameters Ωt (t = 2, 4, 6) and fluorescent lifetimes were obtained by Judd-Ofelt theory. The similar values of Judd–Ofelt parameters and the full-width at half-maximums of ∼1800 nm indicate the local environment of Tm3+ changes little with increment of Tm2O3 concentrations. Maximum stimulated emission cross-section of ∼1800 nm is 6.22 × 10−21 cm2 as calculated by Fuchtbauer–Ladenburg formula. Energy migration among Tm3+ ions was analyzed by the extended overlap integral method. The non-radiative transition rates between mainly energy levels of Tm3+ were calculated. Non-radiative transition rate of 3F4 energy level caused by OH was analyzed by rate equation and deduced by fitting the fluorescence decay curve.
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