2 μm mid-infrared optical spectra of Tm3+-doped germanium gallate glasses  

作　　者：XIA Haiping LIN Qiongfei ZHANG Jianli ZHANG Qinyuan 

机构地区：Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China

出　　处：《Journal of Rare Earths》2009年第5期781-785,共5页稀土学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China (60777030), the Open Foundation of Key Laboratory of Ningbo City ((2007A22010), and K.C. Wong Magna Fund in Ningbo University

摘　　要：Glasses with the composition of 65GeO212Ga2O3-10BaO-8Li2O-5La2O3(molar ratio) doped with 1.526 wt.%, 3.006 wt.%, 5.836 wt.%, 11.028 wt.%, and 15.678 wt.% Tm2O3, respectively, were fabricated by conventional melting method. According to the absorption spectra and the Judd-Ofelt theory, the J-O strength parameters (Ω2,Ω4, Ω6) were calculated, with which the radiative transition probabilities,branching ratios and radiative lifetimes were obtained. The infrared emission spectra (with 808 nm LD excitation) at～1.47 and～1.8 μm of various concentrations of Tm3+-doped glasses were studied. The emission intensity at～1.8 μm reached to the maximum when the Tm2O3-doping concentration was near to be～3.006 wt.% (1.0 mol.%), and then decreased as doping concentration increased further. The mechanism of the fluorescence intensity change was explained with the cross-relaxation effect and the concentration quenching effect of Tm3+. Meanwhile, according to McCumber theory, the absorption and emission cross-sections corresponding to the 3F4→3H6 transitions of Tm3+ at 1.8 μm was obtained. For Tm3+-doped germanate glasses, the maximum emission cross-section reached a value higher than that re-ported for fluorozircoaluminate glasses. It is expected to be a favorable candidate host for～2.0 μm mid-inflated laser because the glass shows favorable optical spectra.

关 键 词：Tm3+-doped germanium-gallate GLASSES spectral properties cross RELAXATION emission CROSS-SECTION rare earths 

分 类 号：TF845-55[冶金工程—有色金属冶金]