Ga2O3组分对Tm3+掺杂GeO2-Ga2O3-Li2O-BaO-La2O3玻璃的光谱性能影响

制备了Tm³⁺(8.0mol%)掺杂(77-x)GeO₂-xGa₂O₃-8Li₂O-10BaO-5La₂O₃(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-Ofelt(J_O)理论计算得到了Tm³⁺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Tm³⁺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Ga₂O₃对Tm³⁺荧光光谱特性的影响.随着Ga₂O₃从4mol%增加到16mol%，Tm³⁺在1.8μm处的荧光强度呈现先减弱后增强的特性.当Ga₂O₃含量大约在12mol%时，Tm³⁺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. 关键词： 3+掺杂锗酸盐玻璃')" href="#">Tm³⁺掺杂锗酸盐玻璃 光谱性能 Judd-Ofelt参数 热稳定性

Effect of Ga2O3 on the spectroscopic properties of Tm3+-doped GeO2-Ga2O3-Li2O-BaO-La2O3 glasses

Glasses with the compositions of (77-x)GeO₂-xGa₂O₃-8Li₂O-10BaO-5La₂O₃(x=4,8,12,16) doped with 8.0mol% of Tm³⁺ were fabricated. The spectroscopic properties and thermal stability were investigated experimentally with increasing Ga₂O₃ 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-Ofelt theory, the Judd-Ofelt strength parameters (Ω₂，Ω₄，Ω₆) of Tm³⁺-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 Tm³⁺-doped germanate glasses and the effects of Ga₂O₃ on the emission properties were investigated with 808nm 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 12mol%, and then increase. The effects of Ga₂O₃ on the glass structure and the spectral parameters were also preliminarily investigated.