摘要
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 5 3μm4 I1 3 2 →4 I1 5 2 发光外 (荧光半高宽高达 6 9nm) ,该玻璃还存在很强的2 H1 1 2 →4 I1 5 2 ( 5 2 7nm) ,4 S3 2 →4 I1 5 2( 5 4 9nm)和4 F9/2 →4 I1 5/2 ( 6 6 6nm)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 - 2 0 cm2 ,Ω4 =2 0 8× 10 - 2 0 cm2 ,Ω6 =1 16× 10 - 2 0 cm2 ,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 5 3μm处的玻璃受激发射截面可达 8 75× 10 - 2 1 cm2 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 。
We report on fluorescence and upconversion emissions of Er3+ -doped TeO2-ZnO-PbCl2 tellurite-based oxyhalide glasses under 977nm laser diode excitation. A strong 1.53mum emission from I-4(13/2 -->) I-4(15/2) transition with a full width at half maximum of similar to 69 nm, and three intense infrared - to - visible upconversion emissions at 524, 546 and 668 nm, corresponding to H-2(11/2) --> I-4(15/2), S-4(3/2) --> I-4(15/2) and F-4(11/2) --> I-4(15/2) transitions of Er3+ ions, respectively, have been observed under 977nm excitation and the mechanisms involved have been explained. The intensity parameters Ohm(t) (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 Ohm(2) = 5.9 x 10(-20) cm(-2), Ohm(4), = 2.1 x 10(-20) c(m-)2 and Ohm(6) = 1.2 x 10(-20) cm(-2), respectively. The emission cross-section has also been calculated from the absorption crosssection and the emission spectrum by using the McCumber theory. The maximum emission cross-section is 8.75 x 10(-21) cm(-2) at 1.53mum. Our results indicate that TeO2-ZnO-PbCl2 oxyhalide glasses are promising candidates for optical amplifiers and upconversion lasers in comparison with the glasses such as silicate, phosphate, and fluoride glasses.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第1期422-428,共7页
Acta Physica Sinica
基金
广东省自然科学基金 (批准号 :0 13 0 13 )
广东省"十五"重大科技专项项目(批准号:2 0 0 2B1160 4)资助的课题~~
