掺Tm3+锗酸盐玻璃的光谱参数计算

用高温熔融法制备了TM3+ (0.5mol%)离子掺杂65GeO2-8Li2O-5La2O3-10BaO-12Ga2O3和65GeO2-8Li2O-5La2O3-10BaF2-12AlF3 (摩尔分数)玻璃,并测试了玻璃的吸收光谱和折射率与密度等参数.根据吸收特性及测得的一些物化参数,应用Judd-Ofelt理论计算了TM3+离子在上述玻璃中的强度参数(Ω2,Ω4,Ω6)及TM3+各能级的自发跃迁几率、荧光分支比以及辐射寿命等光谱参量.     

Tm3+掺杂GeO2-AlF3-Li2O-BaF2-La2O3玻璃的光谱特性

用高温熔融法制备了不同TM3+浓度掺杂的65GeO2-12AlF3-8Li2O-10BaF2-5La2O3-Xtm2o3(x=0.5 mol%,1.0 mol%,2.0 mol%,4.0 mol%,6.0 mol%)玻璃.从吸收光谱特性出发,根据Judd_Ofelt理论,计算得到了TM3+离子的J-O强度参数(Ω2,Ω4,Ω6)及TM3+离子各激发能级的自发跃迁几率、荧光分支比以及辐射寿命等光谱参量.在808 nm波长的激发下,研究了不同TM3+掺杂浓度下玻璃在～1.47μm与～1.8μm处的荧光特性,在掺杂浓度约达到1.0 mol%时,在1.8 μm处的荧光强度达最大,然后随着掺杂浓度的增大,其荧光强度反而降低.作者从TM3+的交叉驰豫与浓度猝灭效应解释了这一荧光强度变化的过程.     

Gain properties of germanate glasses singly doped with Tm^3＋ and Ho^3＋ ions

Two kinds of germanate glasses singly doped with the ion concentration of 2.0mol.%Tm3+ and 2.0mol.%Ho3+, respectively, were prepared. According to McCumber theory, the absorption and stimulated emission cross-sections corresponding to the 3H6←→3F4 transitions of Tm3+ (at 1.8 μm) and the 5I8←→5I7 transitions of Ho3+ (at 2.0 μm) were obtained, and respective gain cross-section spectra were also computed as a function of population inversion according to absorption and emission cross-sections and the ion concentrations. For Tm3+-doped germanate glasses, the maximum of the absorption, emission, and gain cross-sections reached a value higher than those reported for fluorozirconate, fluoride, and oxyfluoride glasses. For Ho3+-doped germanate glasses, the maximum of absorption, emission, and gain cross-sections reached a value higher than that reported for fluorozircoaluminate glasses. Hence, these Tm3+-doped and Ho3+-doped germanate glasses exhibited an advantage for application in mid-infrared lasers at about 1.8 and 2.0 μm wavelength.