【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Er3+离子发光光谱的强度参数Ωi(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Er3+离子浓度变化对以上这些参数的影响。测试了Er3+4I13/2→4I15/2跃迁对应的荧光光谱和Er3+4I13/2能级荧光寿命。最后应用McCumber理论计算了玻璃中Er3+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Er3+离子浓度的增大而增强;随着Er3+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;Er3+4I13/2→4I15/2的发射截面随Er3+离子浓度的增大而改变很小,有效线宽都在50nm左右。更多还原

【Abstract】 Er³⁺-doped tellurite glasses with four different concentrations were fabricated, and the oscillator strength of Er³⁺ in the tellurite glasses were calculated through the absorption spectra of the glasses. The Judd-Ofelt intensity parameter Ω_i, spontaneous transition probability A, fluorescence branching ratio β, and radiative lifetime τ rad of Er³⁺ 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 fluorescence spectra of Er³⁺: 4I 13/2 → 4I 15/2 transition and the lifetime of Er 3+ : 4I 13/2 level of the samples were measured. The stimulated emission cross-section of 4I 13/2 → 4I 15/2 transition 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+ : 4I 13/2 → 4I 15/2 transition of the samples changes slightly with the increase in the Er 3+ concentration. All the fluorescence effective line widths for the four different Er³⁺ concentration samples are nearly 50 nm.更多还原