掺Er^(3+)碲酸盐玻璃的光谱性质与Judd-Ofelt理论分析  

Spectroscopic Properties and Judd-Ofelt Theory Analysis of Er^(3+) Doped Tellurite Glass

作　　者：李广坡[1] 徐铁峰[1] 聂秋华[1] 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

出　　处：《发光学报》2006年第2期164-168,共5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);宁波市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碲酸盐玻璃(70TeO2-9B2O3-6Nb2O5-5Na2O-10ZnO-1%(质量分数)Er2O3)样品。测试了玻璃样品的吸收光谱和荧光光谱。应用Judd-O felt理论计算了Er3+离子的谱线强度、自发辐射跃迁几率、荧光分支比、辐射寿命等光谱参数,并拟合了相应的强度参数Ωt(t=2,4,6)(Ω2=8.01×10-20cm2,Ω4=2.09×10-20cm2,Ω6=1.15×10-20cm2)。结果发现该碲酸盐玻璃具有较大的Ω2值,说明Er—O键的共价性强于它在硅酸盐、锗酸盐、氟化物、铋酸盐和磷酸盐玻璃中的共价性。Er3+在碲酸盐玻璃中4I13/2→4I15/2跃迁几率约为492 s-1,表明Er3+可能有较强的1.5μm发射。分析了Er3+在碲酸盐玻璃中能级4I13/2→4I15/2发射的荧光半峰全宽(FWHM=73 nm),并应用M cCumber理论计算了Er3+的受激发射截面(σe=1.08×10-20cm2),发现其FWHM×σe远大于Er3+在铋酸盐、磷酸盐、锗酸盐和硅酸盐玻璃中的受激发射截面,说明碲酸盐玻璃是一种制备宽带光纤放大器的优良基质材料。The new Er^3＋ doped tellurite glass （70TeO2-9B2O3-6Nb2O5-5Na2O-100ZnO） was prepared by the technique of high-temperature melting. The on spectra and emission spectra of the glass sample have been measured and investigated. The Judd-Ofeh intensity parametersΩ1, （t = 2,4,6） （Ω4 =8.01 × 10^-20 cm^2 ,Ω6 =2.09× 10^-20 cm^2, Ω6 = 1.15 × 10^-2 cm：）, transition probabilities, excited state lifetimes and the branching ratios have been predicted of several Er^3＋ ions transitions based on the Judd-Ofeh theory. Compared with the other glass hosts,it found that the Ω2 is bigger of Er^3＋ in this tellurite glass, which shows that the covalency between the Er^3＋ and O^2- is stronger than silicate, germanate, fluorid, bismuthate, and phosphate glass. The transition probability of Er^3＋ in this tellurite glass is about 492 s^-1, indicating that Er^3＋ ions could have strong transition at 1.5 μm in tellurite glass. The broad 1.5 μm fluorescence was observed under 970 nm excitation, and its full width at half maximum （FWHM） is 73 nm. The emission cross-section was calculated according to the McCumber theory. The cross section was quite large due to a large refractive index of the host. The value of FWHM × σe for Er^3＋ in tellurite glass is more larger than that of the bismuth, phosphate, germinate and silicate glass. The results showed that the broad and flat 4^Ⅰ13/2→4^Ⅰ15/2 emission of Er^3＋ ions around 1.5 μm can be uses as an potential optical amplifier for the wavelength-division -multiplexing （WDM） network system.

关 键 词：光学材料 碲酸盐玻璃 光谱性质 JUDD-OFELT理论 

分 类 号：O482.31[理学—固体物理] TQ171[理学—物理]