中文摘要：

用高温熔融法制备了Ho^3＋掺和Ho^3＋／Yb^3＋共掺、组分为TeO2-ZnO-Na2O的碲酸盐玻璃，应用Judd-Ofeit（JO）理论计算分析了玻璃的强度参数Ωt（t=2，4，6）、自发辐射跃迁几率A、荧光分支比β和荧光辐射寿命τrad等各项光谱参数。通过测量上转换光谱，着重研究了Yb^3＋掺杂对于Ho^3＋上转换发光性能的影响，分析了Yb^3＋／Yb^3＋以及yb^3＋／Ho^3＋间的能量传递过程。结果显示，975rim泵浦下Ho抖的上转换发光主要来自于YbH／Yb汁间的共振能量传递以及基于单声子和双声子辅助的Yb^3＋／Ho^3＋间的能量传递过程，并计算得到了声子贡献比和能量传递微观参数。同时，计算分析了Ho^3＋：^I7→^5Is能级跃迁的吸收截面、受激发射截面和增益系数。研究表明，YbH／HOH共掺TeO2-ZnO-Na2O玻璃可以作为上转换激光器和2．0μm波段固体激光器的潜在增益基质。

英文摘要：

Ho^3＋ single-doped and Ho^3＋/Yb^3＋ co-doped tellurite glasses with the composition of TeO2- ZnO-Na2 O were prepared by melt-quenching method. The intensity parameters Ωt （t= 2,4,6）, spontaneous radiative transition rate A, fluorescence branching ratio β and radiative lifetime τrad of Ho^3＋ are calculated based on the measured absorption spectra with the Judd-Ofelt theory. The influence of Yb^3＋ doping on the Ho^3＋ upconversion emission is investigated through the measurement of upconversion spectra,and the energy transfer mechanisms between the Yb^3＋/Yb^3＋ and Yb^3＋/Ho^3＋ ions are analyzed in detail. The results show that the upconversion emission of Ho^3＋ ions under 980 nm diode laser excitation is mainly the result of energy transfers：first the resonant energy transfer from Yb^3＋ to Yb^3＋ ions,and then the one and two phonon-assisted nortresonam energy transfer from Yb^3＋ to Ho^3＋ ions. The energy transfer coefficient and phonon contribution for the above energy transfer process are calculated and analyzed. Meanwhile, the absorption, emission cross-sections and gain coefficient of Ho^3＋ ： ^5 I7 →%5 I8 transitions are calculated. The research shows that the Yb^3＋/Ho^3＋ co-doped TeO2-ZnO-NazO glass is a promising host material applied for upconversion laser and 2.0μm-band solid iaser.