中文摘要：

制备了四种不同铒离子掺杂浓度的碲酸盐玻璃，通过测定吸收光谱计算了吸收谱线的振子强度，根据Judd-Ofelt理论计算了不同浓度下Er^3＋离子发光光谱的强度参数Ω（i=2，4，6），计算了自发辐射电偶和磁偶跃迁概率、辐射寿命、荧光分支比等参数，讨论了Er^3＋离子浓度变化对以上这些参数的影响。测试了Er^3＋：^4I13／2→^4I15／2跃迁对应的荧光光谱和Er^3＋：^4I13／2能级荧光寿命。最后应用McCumber理论计算了玻璃中Er^3＋：^4I13／2→^4I15／2跃迁对应的受激发射截面大小。结果表明：振子强度基本上随Er^3＋离子浓度的增大而增强；随着Er^3＋离子浓度的增加，自发辐射跃迁概率A基本呈现出递增的趋势，但荧光分支比β却只有很小的变化；Er^3＋：^4I13／2→^4I15／2的发射截面随Er^3＋离子浓度的增大而改变很小，有效线宽都在50nm左右。

英文摘要：

Er^3＋-doped tellurite glasses with four different concentrations were fabricated, and the oscillator strength of Er^3＋ in the tellurite glasses were calculated through the absorption spectra of the glasses. The Judd-Ofelt intensity parameter Ωi, spontaneous transition probability A, fluorescence branching ratio β, and radiative lifetime τrad of Er^3＋ were calculated on the basis of Judd-Ofelt theory, and the effect of the erbium ion concentration on the above optical parameters was also discussed. The fluo- rescence spectra of Er^3＋ ： ^4I13/2→^4I15/2 transition and the lifetime of Er^3＋ ： 4^I13/2 level of the samples were measured. The stimulated emission cross-section of ^4I13/2→^4I15/2transition of the samples was finally calculated by using McCumber theory. The results show that with the increase in the Er^3＋ concentration, the oscillator strength and spontaneous transition probability A of Er^3＋ increase, while the fluorescence branching ratio β of Er^3＋ shows little difference. The stimulated emission cross-section of Er^3＋ ：^4I13/2→^4I15/2 transition of the samples changes slightly with the increase in the Er^3＋ concentration. All the fluorescence effective line widths for the four different Er^3＋ concentration samples are nearly 50 nm.