掺钕镉铝硅酸盐玻璃的Judd-Ofelt理论分析与光谱特性  

Judd-Ofelt Theory Analysis and Spectroscopic Properties of Nd^(3+)-Doped Cadmium Aluminium Silicate Glasses

作　　者：陈月娥[1] 邵秋峰[2] 贾丽笑 

机构地区：[1]燕山大学,河北秦皇岛066004 [2]国防科技大学,湖南长沙410022

出　　处：《光谱学与光谱分析》2017年第5期1345-1349,共5页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(11504320;61471312);河北省自然科学基金项目(F2015203240)资助

摘　　要：以掺杂光子晶体光纤为介质的光纤激光器一直受到科研工作者的广泛关注,应用于光子晶体光纤纤芯的掺稀土元素玻璃的制备成为研制掺杂光子晶体光纤的关键问题。利用高温熔融工艺制备钕离子掺杂的40SiO_2-14Al_2O_3-(40-x)CdO-2Li2O-2K2O-2Na_2O-xNd_2O_3(x=0.07,0.14,0.21,0.35,0.42,0.56mol)重金属硅酸盐玻璃系统,测试了其吸收光谱和荧光光谱。采用Judd-Ofelt理论,计算了玻璃样品的强度参数Ωt(t=2,4,6)以及钕离子的自发辐射概率、荧光分支比、荧光辐射寿命等参数。利用测得的荧光光谱计算了钕离子能级跃迁4 F3/2→4 I11/2的受激发射截面及荧光有效线宽。结果表明:当掺Nd_2O_3的摩尔分数为0.42时,制备的镉铝重金属硅酸盐玻璃具有较大的受激发射截面和比较宽的荧光有效线宽,且与相关文献中的钕离子掺杂玻璃相比,具有良好的激光性能和增益性能,有望在研制掺杂光子晶体光纤中得到应用。Photonic crystal fiber laser has been attached great attention by many researches,and preparation of photonic crystal fiber cores becomes the key problem in study of photonic crystal fibers.Nd3＋doped lithium-cadmium heavy-metal silicate glass samples have prepared with the method of high temperature melting,which 40SiO2-14Al2O3-（40-x）CdO-2Li2O-2K2O-2Na2OxNd2O3（x=0.07,0.14,0.21,0.35,0.42,0.56mol）samples have been measured absorption and fluorescence spectra.Applying Judd-Ofelt theory,its intensity parameterΩt（t=2,4,6）,the oscillator strength and spontaneous radiation probability of the Nd3＋ion,fluorescence branching ratio,and the fluorescence lifetime were theoretically calculated.Using fluorescence spectrum,the stimulated emission cross section of the 4 F3/2→4 I11/2transition and the full width at half maximum of the fluorescence band were also measured.The result demonstrates that the Nd3＋doped lithium-cadmium heavy-metal silicate glass sample When mixing Nd2O3 mole fraction of is 0.42 possesses a large stimulated emission cross section and a wide fluorescence band compared with the literature of neodymium ions doped glass.These parameters clearly indicate that this kind of silicate glass has a good laser excitation property and is expected to be applied in the study of the doped photonic crystal fibers.

关 键 词：Nd3+掺杂 荧光光谱 JUDD-OFELT理论 受激发射截面 

分 类 号：O433.4[机械工程—光学工程]