Tm^(3+)/Er^(3+)/Ho^(3+)共掺SiO_2-Bi_2O_3-AlF_3-BaF_2玻璃发光性能

Spectroscopic Properties of Tm^(3+)/Er^(3+)/Ho^(3+) Co-doped SiO_2-Bi_2O_3-AlF_3-BaF_2 Glasses

采用高温熔融法制备了Tm^(3+)/Er^(3+)/Ho^(3+)共掺的铋硅酸盐50SiO 2-40Bi_2O_3-5AlF_3-5BaF_2玻璃。研究了在808 nm激光器(Laser Diode)激发下Tm^(3+)/Er^(3+)/Ho^(3+)共掺的铋硅酸盐在2 060 nm处的发光性能,同时测试及分析了该铋硅酸盐玻璃的差热特性、吸收光谱及荧光光谱。根据吸收光谱以及Judd-Oflet理论,计算了Ho^(3+)的Judd-Oflet强度参数Ωt(t=2,4,6)以及Tm^(3+)/Er^(3+)/Ho^(3+)相应的吸收截面。铋硅酸盐玻璃中,Tm_2O_3、Er_2O_3和Ho_2O_3掺杂浓度分别为0.75%、1.0%和0.5%时,2 060 nm处Ho^(3+)∶5I7→5I8发射峰强度达到最大。对Tm^(3+)/Er^(3+)/Ho^(3+)3种离子的光谱性质和离子间可能存在的能量传递也做了分析。Ho^(3+)在1 953 nm处的最大吸收截面σabs为9.08×10-21 cm^2,在2 060 nm处的最大发射截面σem为1.168×10-20 cm^2,辐射寿命τmea为2.75 ms,具有良好的增益效应σemτ(3.212×10-20cm^2·ms)。

The Tm3＋, Er3＋ and Ho3＋ co-doped bismuth silicate glasses 50SiO2-40Bi2Oz-5A1F3-5BaF2 were prepared by high-temperature melt-quenching method. The spectroscopic properties of Tm3＋, Ere＋ and Ho3＋ co-doped bismuth silicate at 2 060 nm exited by 808 nm Laser Diode were investigated. Thermal stability of the glasses, absorption spectra and fluorescence spectra of the Tm3＋, Ere＋ and Ho3＋ co-doped glass samples were measured. According to the absorption spectrum and Judd-Oflet theory, the Judd-Oflet intensity parameters of Ho3＋ Ω（t=2,4,6）, absorption cross sections of Tm3＋, Er3＋ and Ho3＋ were calculated, respectively. The measured fluorescence spectra manifest that the maximal emission intensity of Ho3＋：5I7→5I8 at 2 060 nm can be achieved at the concentration of 0.75% Tm2O3, 1.0% Er2O3 and 0.5% Ho2O3 in bismuth silicate glasses. Besides the spectroscopic properties of Tm3＋, Er3＋ and Ho3＋ separately and possible energy transfer mechanisms among Tm3＋, Er3＋ and Ho3＋ were analyzed and discussed in detail. The maximal absorption and emission cross sections of Ho3＋ are 9.08×10-21 cm2 at 1 953 nm and 1.168×10-20cm2 at 2 060 nm, respectively, with a lifetime of 2.75 ms, while large σemτ achieved （3.212×10-20 cm2- ms） suggesting its efficient application in 2 μm fiber lasers.