Yb3+对掺铒碲酸盐玻璃红外和上转换发光的影响

研制了Er3+/Yb3+共掺TeO2-ZnO-La2O3玻璃,测试了Er3+离子的吸收谱、荧光谱和上转换发光谱,系统研究了975 nm抽运下Yb3+离子对于Er3+离子1.5 μm波段荧光性能及其上转换发光性能的影响.结果表明,随着碲酸盐玻璃中Yb2Os含量的增加,Yb3+离子对Er3+离子的能量传递增强,Er3+离子1.5 μm波段的荧光强度和上转换发光强度相应增大,但后者相对于前者增加更为迅速.通过对粒子数速率方程的理论模拟,计算结果与实验测量结果较为一致,表明Er3+/Yb3+共掺碲酸盐玻璃是一种优良的潜在上转换激光器增益介质.对上转换发光分析表明,强烈的绿光和红光激发是基于双光子的吸收过程.

Effect of Yb3+ on Infrared and Upconversion Emission of Er3+-Doped Tellurite-Based Glasses

Er3+/Yb3+ co-doped TeO2-ZnO-La2O3 glasses were prepared, and the absorption spectra, fluorescence spectra and upconversion emission spectra of Er3+ ions were measured. Effects of Yb3+ on the infrared fluorescence at 1.5 μm band and the visible upconversion luminescence of Er3+ in the glasses were investigated under the excitation at 975 nm. With the increase of Yb2O3 concentration, the 1.5 μm band infrared fluorescence intensity and the visible upconversion luminescent intensity increase evidently due to the effective energy transfer from Yb3+ to Er3+, but the latter increases more efficiently. According to the simulation of rate equations, the theoretical result agrees well with the experiment, indicating that Er3+/Yb3+ co-doped tellurite-based glass is a promising gain media suitable for developing upconversion fiber lasers. And the analysis to upconversion emission shows that a two-photon upconversion process is assigned to the intense green and red emission, respectively.