Er^(3+)/Yb^(3+)共掺锗碲酸盐玻璃的光谱性质及Judd-Ofelt理论分析  

Spectroscopic Properties and Judd-Ofelt Theory Analysis of a New Er^(3+)/Yb^(3+)-codoped Germanotellurite Glass

作　　者：高媛[1] 聂秋华[1] 徐铁峰[1] 侯帅[2] 沈祥[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]公安海警高等专科学校后勤管理系,浙江宁波315801

出　　处：《发光学报》2006年第1期47-52,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(60272034);浙江省自然科学基金(601011);宁波科技局重点博士基金(02J20101-01)资助项目

摘　　要：用高温熔融法制备了一种Er3+/Yb3+共掺的70TeO2-5Li2O-10B2O3-15GeO2玻璃,测试和分析了其热稳定性、吸收光谱、荧光光谱以及红外吸收谱。应用Judd-Ofelt理论计算了玻璃中Er3+的强度参数、自发辐射跃迁几率、辐射寿命以及荧光分支比,同时比较了OH-的存在对玻璃发光特性的影响。结果表明:这种玻璃具有较好的热稳定性,较宽的荧光半峰全宽和较大的受激发射截面,是一种较为合适的宽带光纤放大器的基质材料,OH-的存在使得Er3+离子的荧光强度降低,荧光寿命减小。Er^3＋ -doped and Er^3＋/Yb^3＋ -codoped materials have played an important role in the development of broadband erbium-doped fiber amplifiers （EDFA） at the third communication window for their potential laser applications. Therefore, the choice of host material is very important in the development of more efficient optical amplifiers based on Er^3＋-doped glasses. The new Er^3＋/Yb^3＋-codoped 70TeO2-5Li2O-10B2O3-15GeO2 glass was prepared by the technique of high-temperature melting. The thermal stability, absorption spectra, fluorescence spectra and FF-IR spectra were measured and investigated. The effect of OH^- on the spectroscopic properties of glass sample was discussed. The Judd-Ofeh theory analysis on the absorption spectra was performed and compared with other glass hosts. The oscillator strength ,spontaneous emission probability,radiative lifetime and emission branching ratio of several Er^3＋ transitions were calculated according to the obtained Judd-Ofelt parameters. It was found that this studied glass has good thermal stability and it is a perfect candidate material for fiber drawing. The Judd-Ofelt parameters deriving from the absorption spectra were acquired as follows： Ω2 = 5.65×10^-20 cm^2,Ω4 = 1.21×10^-20 cm^2,Ω6=0. 95×10^-20 cm^2. The broad FWHM（77 nm） was obtained from the fluorescence spectra and the large stimulated emission cross-section σe^peak（ 8.7×10^-21 cm^2） was calculated by the McCumber theory. The product of FWHM×σe^peak is larger than those of other glass hosts, which indicating that this studied glass may be a potentially useful candidate materiai host for broadband optical amplifier. In addition, the fluorescent intensity and lifetime of the ^4I13/2 level of Er^3＋ ions will decrease with the existence of OH^- content. The lifetime of the ^4I13/2 level of Er^3＋ ions increase from 1.7 ms to 2.31 ms after removing water during the melting process.

关 键 词：锗碲酸盐玻璃 热稳定性 光谱特性 Judd—Ofelt理论 OH^- 

分 类 号：O482.31[理学—固体物理] TQ171.735[理学—物理]