2 μm mid-infrared optical spectra of Tm3+-doped germanium gallate glasses
来源期刊：Journal of Rare Earths2009年第5期
论文作者：夏海平 林琼斐 章践立 张勤远
文章页码：781 - 785
摘 要：Glasses with the composition of 65GeO2-12Ga2O3-10BaO-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 reported for fluorozircoaluminate glasses. It is expected to be a favorable candidate host for ～2.0 μm mid-infrared laser because the glass shows favorable optical spectra.
夏海平1，林琼斐1，章践立1，张勤远2
1. Laboratory of Photo-electronic Materials,Ningbo University2. Key Laboratory of Specially Functional Materials of Ministry of Education and Institute of Optical Communication Materials,South China University of Technology
摘 要：Glasses with the composition of 65GeO2-12Ga2O3-10BaO-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 reported for fluorozircoaluminate glasses. It is expected to be a favorable candidate host for ～2.0 μm mid-infrared laser because the glass shows favorable optical spectra.
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