977nm抽运下掺铒碲酸盐基氧卤玻璃的光谱特性

研究了掺铒TeO2-ZnO-PbCl2碲酸盐基氧卤玻璃在977nm激光二极管抽运下的发光和上转换发光特性，结果发现除红外153μm4I13/2→４I15/2发光外（荧光半高宽高达69nm），该玻璃还存在很强的２Ｈ11/2→４I15/2（527nm），４Ｓ3/2→４I15/2（549nm）和４Ｆ９／２→４Ｉ１５／２（666nm）可见上转换发光.应用Judd-Ofelt理论计算得到玻璃强度参数Ωt（t=2，4，6）分别为Ω2=587×10-20cm2，Ω4=208×10-20cm2，Ω6=116×10-20cm2，计算了铒离子跃迁振子强度、自发辐射概率、荧光分支比、荧光寿命等光谱参量.应用McCumber理论计算得153μm处的玻璃受激发射截面可达875×10-21cm2实验结果表明，与硅酸盐玻璃、磷酸盐玻璃、氟化物玻璃等比较，掺铒碲酸盐基氧卤玻璃在宽带掺铒光纤放大器和上转换激光器中有着极大的研究和应用潜力.关键词：掺Er3+碲酸盐玻璃氧卤玻璃Judd-Ofelt理论光谱性质

Optical properties of Er3+ in TeO2-based oxyhalide glasses pumped by 977nm

We report on fluorescence and upconversion emissions of Er3+-doped TeO2-ZnO-PbCl2 tellurite-based oxyhalide glasses under 977nm laser diode excitation. A strong 153μm emission from 4I13/2→4I15/2 transition with a full width at half maximum of ～69 nm, and three intense infrared -to-visible upconversion emissions at 524, 546 and 668 nm, corresponding to 2H11/2→4I15/2, 4S3/2→4I15/2 and 4F11/2→4I15/2 transitions of Er3+ ions, respectivel y, have been observed under 977 nm excitation and the mechanisms involved have b een explained. The intensity parameters Ωt (t=2,4,6) of Er3+-doped TeO2-ZnO-PbCl2 oxyhalide glasses have been calculated according to the Judd- Ofelt theory, and the results are Ω2=59×10-20cm2，Ω4=2 1×10-20cm2，and Ω6=12×10-20cm2，respectively. The e mission cross_section has also been calculated from the absorption cross-section and the emission spectrum by using the McCumber theory. The maximum emission cr oss_section is 875×10-21cm2 at 153μm. Our results indicate that Te O2_ZnO_PbCl2 oxyhalide glasses are promising candidates for optical amplifie rs and upconversion lasers in comparison with the glasses such as silicate, phos phate, and fluoride glasses.