2 μm mid-infrared optical spectra of Tm~(3+)-doped germanium gallate glasses
来源期刊：JOURNAL OF RARE EARTHS2009年第5期
论文作者：LIN Qiongfei ZHANG Qinyuan ZHANG Jianli XIA Haiping
Key words：Tm3+-doped germanium-gallate glasses; spectral properties; cross relaxation; emission cross-section; rare earths;
Abstract: Glasses with the composition of 65GeO_2-12Ga_2O_3-10BaO-8Li_2O-5La_2O_3(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 (Ω_2,Ω_4,Ω_6) 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 Tm~(3+). Meanwhile, according to McCumber theory, the absorption and emission cross-sections corresponding to the ~3F_4→~3H_6 transitions of Tm~(3+) 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.
LIN Qiongfei1，ZHANG Qinyuan2，ZHANG Jianli1，XIA Haiping1
(1.Laboratory of Photo-electronic Materials, Ningbo University, Ningbo 315211, China;
2.Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510641, China)
Abstract:Glasses with the composition of 65GeO_2-12Ga_2O_3-10BaO-8Li_2O-5La_2O_3(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 (Ω_2,Ω_4,Ω_6) 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 Tm~(3+). Meanwhile, according to McCumber theory, the absorption and emission cross-sections corresponding to the ~3F_4→~3H_6 transitions of Tm~(3+) 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.
Key words:Tm3+-doped germanium-gallate glasses; spectral properties; cross relaxation; emission cross-section; rare earths;
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