中文摘要：

用高温熔融法制备了Tm3＋/Ho3＋共掺碲酸盐玻璃（TeO2-ZnO-Na2O）,根据测量得到的吸收光谱,应用Judd-Ofelt理论计算分析了玻璃样品中Ho3＋离子的强度参数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。同时,测量得到了不同Ho3＋离子掺杂浓度下玻璃样品的荧光发射谱。结果显示,在808nm抽运光激励下Tm3＋/Ho3＋共掺碲酸盐玻璃样品发射出较强的2.0μm中红外荧光。分析表明,较强的Ho3＋离子中红外荧光来自于Tm3＋/Tm3＋离子间共振的能量传递过程,以及Tm3＋/Ho3＋离子间基于零声子和单声子辅助非共振的两部分能量传递过程。由此进一步计算得到了Tm3＋/Tm3＋、Tm3＋/Ho3＋离子间的能量传递微观速率、临界半径和声子的贡献。最后,计算分析了Ho3＋…5I7→5I8能级间跃迁的2.0μm波段吸收截面、受激发射截面和增益系数。研究表明,Tm3＋/Ho3＋共掺TeO2-ZnO-Na2O玻璃可以作为2.0μm波段中红外固体激光器的潜在增益基质。

英文摘要：

Tm3＋/Ho3＋ co-doped tellurite glasses with the composition of TeO2-ZnO-Na2O are prepared by the high temperature melt-quenching method.The intensity parameters Ωt（t=2,4,6）,spontaneous radiative transition rates A,fluorescence branching ratios β and radiation lifetimes τrad of Ho3＋ are calculated from the measured absorption spectra with the Judd-Ofelt theory.Meanwhile,the fluorescence spectra of glass samples with different doped concentration of Ho3＋ ions are measured,and the results show the intense mid-infrared fluorescence emission around 2.0 μm band in the Tm3＋/Ho3＋ co-doped tellurite glasses pumped by 808 nm diode laser.The analysis indicates that the mid-infrared emission of Ho3＋ ions is mainly the result of resonant energy transfer from Tm3＋ to Tm3＋ ions,and then zero phonon-and one phonon-assisted nonresonant energy transfer from Tm3＋ to Ho3＋ ions.The energy transfer micro-rates,critical radius and phonon contributions for the above energy transfer process are calculated and analyzed.Meanwhile,the absorption,stimulated emission cross-sections and gain coefficient of Ho3＋…5I7→5I8 transitions are calculated.The research shows that Tm3＋/Ho3＋ co-doped TeO2-ZnO-Na2O glass is a promising host material applied for 2.0 μm-band mid-infrared solid laser.