SiO2对Yb^3＋离子在磷酸盐玻璃中扩大Stark分裂的作用  

Effect of SiO_2 on the Stark splitting enlargement of Yb^(3+) in phosphate glass

作　　者：王朋[1,2] 王超[1,2] 胡丽丽[1] 张丽艳[1] 

机构地区：[1]中国科学院上海光学精密机械研究所,高功率激光单元技术研发中心,上海201800 [2]中国科学院大学,北京100049

出　　处：《物理学报》2016年第5期303-309,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61177083)资助的课题~~

摘　　要：基于传统磷酸盐玻璃组分,通过引入SiO_2获得了改性的PS系列玻璃,并研究了Yb^(3+)在PS系列玻璃中下能级Stark分裂及其光谱性质.通过对该系列玻璃的吸收光谱、荧光光谱以及拉曼光谱的表征与分析确定了荧光光谱中最大波长处峰的属性.结果表明:SiO_2的引入显著增大了Yb^(3+)下能级Stark分裂,20 mol%SiO_2可将Stark分裂值从670 cm^(-1)提高到771 cm^(-1).同时,改进的磷酸盐玻璃光谱性能没有出现预期的降低现象,反而得到了一定的改善.实验证明:对传统磷酸盐进行SiO_2改性处理可以解决掺镱磷酸盐固有的较窄Stark分裂问题,使其更适合作为高功率、高能量掺镱激光系统的增益介质材料.Up to now,high-energy large-scale Yb^3＋ laser has still faced to the fact that no proper gain media are available,though researchers made a more than ten year effort for it.Yb：fiuorophosphate glass is the only material used in a laser system,reaching an output of more than 10 TW.As is well known,the thermal blocking of Yb^3＋ laser is a bottleneck in laser operation,which is closely related to the Stark splitting of Yb^3＋ in a gain medium.Conventional Yb：phosphate glass has the advantages in Yb^3＋ concentration,lifetime and cross section over silicate glass,however,its small Stark splitting is the main drawback that induces difficulties in realizing laser output at room temperature.Yb：phosphate glass will be a good gain medium for high power Yb^3＋ laser if the Stark splitting is improved.This study focuses on the enlargement of the Yb^3＋ Stark splitting in phosphate glass by introducing SiO2,thereby achieving a large Stark splitting property compared with the phosphate glass.The glass 60P2O5-7.5Al2O3-15K2O-17.5BaO-1Yb2O3 is used as the base glass,and the modified glass denoted as PS is obtained by doping a certain amount of SiC2.Such a glass is prepared by the conventional melting-quenching method.Lorentz fitting is performed to the absorption and fluorescence spectra for determining the Stark splitting scheme.Raman spectrum is used for the auxiliary judgment of the attributions of the different spectroscopic bands.Then the results are confirmed by the barycenter law of Yb^（3＋） ion.Investigations show that the addition of SiO2 can enlarge the Stark splitting obviously from the original 670 to 771 cm^（-1） in PS3.Scalar crystal field parameter NJ and asymmetry degree around Yb are also increased due to SiO2 incorporation.Meanwhile,spectroscopic properties of PS series glasses,such as fluorescence effective line width（Δλ（eff）） and fluorescence lifetime（τf）,are moderately enhanced.The glass transition temperature is improved greatly,which is very valuable for high power Yb^3�

关 键 词：YB^3+ Stark分裂 磷酸盐玻璃 

分 类 号：TQ171.1[化学工程—玻璃工业]