Tm^(3+)掺杂GeO_2-AlF_3-Na_2O玻璃的制备与光谱特性  

Fabrication and spectral properties of Tm^(3+)-doped GeO_2-AlF_3-Na_2O glasses

作　　者：王勇超[1] 夏海平[1] 章践立[1] 张勤远[2] 

机构地区：[1]宁波大学光电子功能材料重点实验室,浙江宁波315211 [2]华南理工大学光通信材料研究所特种功能材料教育部重点实验室,广东广州510640

出　　处：《光电子．激光》2011年第2期232-236,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60777030);浙江省杰出青年自然科学基金资助项目(R4100364);宁波市重点实验室开放基金资助项目(2007A22010);宁波大学王宽诚幸福基金资助项目

摘　　要：用高温熔融法制备了Tm2O3掺杂深度分别为1、2、3、4和5 wt%的82GeO2-8AlF3-10Na2O(摩尔比)的玻璃。从吸收光谱特性出发,应用Judd-Ofelt(J-O)理论,计算得到了Tm3+的J-O强度参数(Ω2,4Ω,6Ω)及Tm3+各激发态能级的自发跃迁几率、荧光分支比以及辐射寿命等光谱参量。在808 nm波长的激发下,研究了不同Tm3+掺杂浓度下玻璃在1.47与1.80μm处的荧光特性,当掺杂浓度约达到3 wt%时1.80μm处的荧光强度最大,然后随着掺杂浓度的增大其荧光强度反而降低。根据McCumber理论,计算了跃迁3F4→3H6的发射截面及增益截面。研究表明,此系统玻璃有望应用于中红外激光材料。The 82GeO2-8AlF3-10Na2O（molar ratio） glasses containing Tm2O3 in 1,2,3,4,and 5 wt% concentration,respectively were fabricated by conventional high temperature melting method.According to the Judd-Ofelt（J-O） theory,the JO strength parameters（Ω2,Ω4,Ω6） of Tm3＋,the radiative transition probabilities,the branching ratios and the radiative lifetimes were calculated.The fluorescence spectra（with 808 nm LD excitation） at ～1.47 and ～1.8 μm for various concentrations of Tm3＋-doped glasses were observed.The results show that the emission intensity at ～1.8 μm reaches the maximum when the Tm2O3-doping concentration is ～3 wt.%,and then decreases as doping concentration increases further.Meanwhile,the absorption and emission cross sections corresponding to the 3F4→3H6 transitions of Tm3＋ at 1.8 μm were estimated based on McCumber theory,and the gain cross section was calculated.The glasses are the new candidate materials for mid-infrared laser devices.

关 键 词：光纤材料 氟锗酸盐玻璃 Judd-Ofelt(J-O)理论 红外光谱特性 

分 类 号：TQ171[化学工程—玻璃工业]