Tm3+和Ho3+双掺氟锗酸盐玻璃的中红外发光性质质

用高温熔融法制备了Tm3+和Ho3+离子双掺的65GeO2-12AlF3-10BaF2-8Li2O-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Ar，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σe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+（5I7）之间的能量转移效率，增强了~2.0µm的红外发光。

Mid-infrared Luminescence Properties of Tm~(3+) and Ho~(3+) Co-doped Fluorogermanate Glasses

Fluorogermanate glasses with the compositions of 65GeO_2-12AlF_3-10BaF_2-8Li_2O-5La_2O_3 codoped with Tm~(3+) and Ho~(3+) ions are fabricated by conventional melting method.According to the Judd-Ofelt theory,the J-O strength parameters(Ω_2,Ω_4,Ω_6)of Ho~(3+) are calculated,by which the radiative transition probabilities,fluorescence branching ratios and radiative lifetimes are obtained.According to McCumber theory,the absorption and emission cross-sections corresponding to the ~3H_6→~3F_4 transition of Tm~(3+) and the ~5I_8→~5I_7 transition of Ho~(3+)(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 Tm~(3+) and infrared emission spectra of Tm~(3+) sensitized Ho~(3+) ions are studied.The results indicate that the energy transfer efficiency of Tm~(3+)(3F_4)→Ho~(3+)(5I_7)ions is enhanced and the infrared fluorescence intensity at ～2.0 μm is increased as the Ho~(3+) co-doped into glass.