中文摘要：

制备了Tm^3＋（8．0mol％）掺杂（77-x）GeO2-Ga2O3-Li2O-BaO-La2O3（x=4，8，12，16）系列玻璃．系统地研究了Ga2O3从4mol％变化到16mol％时，玻璃的光谱性质与热学性质的变化规律．差热分析表明，随着Ga2O3含量的增加，锗酸盐玻璃的热稳定性增加．运用Judd-Ofeh（J-O）理论计算得到了Tm^3＋在不同Ga2O3含量的GeO2-Ga2O3-Li2O-BaO-La2O3玻璃中的J-O强度参数（Ω2，Ω4,Ω6）及Tm^3＋各激发能级的自发跃迁概率、荧光分支比以及辐射寿命等光谱参量．在808nm激光二极管的激发下，测试并分析了Ga203对Tm”荧光光谱特性的影响．随着Ga20，从4mol％增加到16mol％，Tm^3＋在1．8μm处的荧光强度呈现先减弱后增强的特性．当Ga20，含量大约在12m01％时，Tm“在1．8μm处的荧光强度最弱，受激发射截面达到最小．还初步讨论了Ga2O3对玻璃结构与光谱参数的影响规律．

英文摘要：

Glasses with the compositions of （77- x）GeO2-xGa2O3-8Li2O-10BaO-5La2O3 （x = 4,8,12,16） doped with 8.0mol% of Tm^3＋ were fabricated. The spectroscopic properties and thermal stability were investigated experimentally with increasing Ga2 O3 content from 4mol% to 16mol%. It is noted from differential thermal analysis curves that the thermal stability of the glasses are improved by increasing Ga2O3 According to Judd-Ofeh theory, the Judd-Ofelt strength parameters （ Ω2,Ω4,Ω6 ） of Tm^3 ＋ - doped GeO2-Ga2O3-Li2O-BaO-La2O3 were calculated, by which the radiative transition probabilities, fluorescence branching ratios and radiative lifetimes were obtained. The emission spectra of Tm^3 ＋ -doped germanate glasses and the effects of Ga2 O3 on the emission properties were investigated with 808 nm laser diode excitation. The fluoroscopic intensity and the maximum stimulated emission cross section first decrease along with the increase of Ga2O3 content from 4mol% to 16mol%, and reach a minimum at Ga2O3 content of 12mo1%, and then increase. The effects of Ga2O3 on the glass structure and the spectral parameters were also preliminarily investigated.