Tm^(3+)掺杂锗碲酸盐玻璃的近2μm光谱性质  

Spectroscopic properties of ~2μm emissions of Tm^(3+)-doped germanate-tellurite glasses

作　　者：高松[1,2] 王欣[1,2] 范小康[1,2] 李科峰[1] 廖梅松[1] 胡丽丽[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》2014年第24期319-326,共8页Acta Physica Sinica

基　　金：国家自然科学基金重点项目(批准号:61177083)资助的课题~~

摘　　要：用高温熔融法制备了Tm2O3掺杂浓度为0.25,0.5,0.75,1,1.25,1.5 mol%的40 Ge O2-35Te O2-15Pb O-5Al2O3-2.5Ca O-2.5Sr O锗碲酸盐玻璃.热学性质测试表明该玻璃的转变温度为446℃,没有析晶峰.玻璃的最大声子能量约为750 cm-1.利用Judd-Ofelt理论计算了Tm3+的Judd-Ofelt参数Ωt(t=2,4,6)、不同浓度下Tm3+离子各激发态能级的自发辐射概率、荧光分支比以及辐射寿命等参数.采用808 nm波长抽运源测试了Tm3+离子的荧光光谱.发现掺杂浓度为1 mol%时约1.8μm处的荧光强度最强.根据Mc Cumber理论计算了3F4→3H6的发射截面,其峰值发射截面为6.5×10-21cm2.根据速率方程计算了玻璃中OH引起的Tm3+的3F4能级的无辐射弛豫速率,随着Tm3+浓度增加,OH对3F4能级的猝灭速率增加.这种玻璃有望研制成一种新型的约2μm的激光玻璃材料.Tm2O3-doped 40GeO2-35TeO2-15PbO-5Al2O3-2.5CaO-2.5SrO glasses with different Tm^3＋ ion concentrations are fabricated by conventional melt-quenching method. From the measurements of thermal properties it follows that the glass transition temperature is 446 ℃ and crystallization peak does not exist. The maxmium phonon energy of the host is - 750 cm^-1. The Judd-Ofelt strength parameter Ωt （t = 2, 4, 6）, the radiative transition probalities, the branching ratios and the radiative lifetime are calculated according to Judd-Ofelt theory. The emission spectra of Tm^3＋doped glasses with different Tm2O3 concentrations are measured under the excitation by an 808 nm diode laser. The result shows that the emission intensity at - 1.8 μm reaches a maximal value when the Tm2O3-doping concentration is 1 mol% and then it decreases with the further increase of Tm2O3-doping concentration. The emission cross section of 3F4 → 3H6 is calculated based on the McCumber theory. The peak emission cross-section is 6.5 ×10^-21 cm^2. The non-radiative transition rate of ^3F4 caused by OH is calculated quantitatively by rate equation. The results indicate that the germanate-tellurite glass is a new candidate for mid-infrared laser application.

关 键 词：锗碲酸盐玻璃 Tm^3+掺杂 光谱性质 

分 类 号：TQ171.11[化学工程—玻璃工业]