Spectroscopic Properties and Judd-Ofelt Theory Analysis of Er^(3+)-Doped Heavy Metal Oxyfluoride Silicate Glass

Er^(3+)-doped heavy metal oxyfluoride silicate glass was fabricated and characterized, and the absorption spectrum and fluorescence spectrum of the glass were studied. The Judd-Ofelt intensity parameters Ω_t (t =2, 4, 6), spontaneous transition probability, fluorescence branching ratio and radiative lifetime of each energy levels for Er^(3+) were calculated by Judd-Ofelt theory, and stimulated emission cross-section of (()~4I_(13/2))→(()~4I_(15/2)) transition was calculated by McCumber theory. The results show that fluorescence full width at half maximum and stimulated emission cross-section of Er^(3+)-doped heavy metal oxyfluoride silicate glass are broad and large, respectively. Compared with other host glasses, the gain bandwidth property of Er^(3+)-doped heavy metal oxyfluoride silicate glass is close to those of tellurite and bismuth glasses, and has advantage over those of silicate, phosphate and germante glasses.

掺Er^(3+)重金属氧氟锗酸盐玻璃光谱性质研究

研究了重金属氧氟锗酸盐玻璃中Er3+离子的吸收光谱、有效吸收和发射线宽、荧光光谱、荧光半高宽、荧光寿命、带宽特性和增益性能.应用Judd-Ofelt理论计算了Er3+离子的强度参数Ωt(t=2,4,6),应用McCumber计算了能级4I13/2→4I15/2跃迁的吸收和受激发射截面.结果显示,随PbF2含量增加,Er3+离子的强度参数Ω6,吸收线宽、发射线宽、荧光半高宽、荧光寿命、带宽特性和增益性能都增加.表明掺Er3+重金属氧氟锗酸盐玻璃可作为宽带光纤放大器潜在的基质材料.

Er^(3+)掺杂重金属氧氟锗酸盐玻璃的光谱性质和上转换机理

研究了Er3+掺杂重金属氧氟锗酸盐玻璃的吸收光谱和上转换光谱性质,分析了玻璃中Er3+的上转换发光机理,应用JuddOfelt理论计算了Er3+在玻璃中的强度参数Ωt(t=2,4,6),自发辐射跃迁几率、荧光分支比和辐射寿命。结果表明,在975nm抽运光激发下,观察到强烈的绿光和微弱的红光;绿光和红光发射是由于双光子吸收过程,其上转换机理是能量转换(ET)和激发态吸收(ESA)。拉曼光谱分析表明,对于上转换发光,玻璃结构中的F-离子起到重要作用。