中文摘要：

用高温熔融法制备了Tm3＋和Ho3＋离子双掺的65GeO2—12A1F3-10BaF2—8Li2O-5LA2O3氟锗酸盐玻璃．应用Judd—Ofelt理论，获得了HO3＋离子的强度参量（Ω2，Ω4，Ω6），自发辐射跃迁几率Aτ，辐射寿命τ等光谱参量．根据McCumber理论，计算了玻璃中Tm3＋和Ho3＋离子的吸收截面σa、受激发射截面σn和增益光谱G（λ）．在808nm激光二极管激发下，研究分析了Tm3＋离子的交叉弛豫过程和Tm3＋敏化Ho3＋离子的2．0μm的红外发射光谱．结果表明，一定浓度Ho3＋的共掺提高了Tm3＋（3F4）→Ho3＋（5I2）之间的能量转移效率，增强了～2．0μm的红外发光．

英文摘要：

Fluorogermanate glasses with the compositions of 65GeO2-12A1F3-10BaF2-8Li2O-5LA2O3 codoped with Tm3＋ and Ho3＋ ions are fabricated by conventional melting method. According to the Judd-Ofelt theory, the J-O probabilities, fl strength uorescenc parameters （Ω2,Ω4,Ω6 ） of Ho3＋ are calculated, by which the radiative transition e branching ratios and radiative lifetimes are obtained. According to McCumber theory,the absorption and emission cross-sections corresponding to the 3H6→3F4 transition of Tm3＋ and the sI8→5I7 transition of Ho3＋ （at 2. 0 μm） are obtained, and respective gain cross section spectra are computed as a function of population inversion. With 808 nm LD excitation,the cross-relaxation process of Tm3＋ and infrared emission spectra of Tm3＋ sensitized Ho3＋ ions are studied. The results indicate that the energy transfer efficiency of Tm3＋ （3F4）→ Ho3＋ （517）ions is enhanced and the infrared fluorescence intensity at -2.0 μm is increased as the Ho3＋ co-doped into glass.