Er<sup>3+</sup>掺杂Ge-Ga-S-KBr硫卤玻璃的中红外发光和多声子弛豫的研究

为了获得能输出中红外荧光的理想基质玻璃，用熔融急冷法制备了系列不同Er3+离子掺杂浓度的Ge-Ga-S-KBr硫卤玻璃，测试了样品折射率、吸收光谱、中红外荧光光谱.通过吸收光谱计算了Er3+离子吸收谱线的振子强度，应用Judd-Ofelt理论计算分析了Er3+离子在Ge-Ga-S-KBr硫卤玻璃中的强度参量Ωi( i=2,4,6)、自发辐射跃迁几率A、荧光分支比β等光谱参量.研究了808 nm激光抽运下样品中红外荧光特性与掺杂浓度之间变化关系，并用Futchbauer-Ladenburg公式分别计算了2.8 μm处的受激发射截面.结果表明，在808 nm激光抽运下观察到了2.8 μm中红外荧光，对应于Er3+∶4I11/2→4I13/2跃迁，当Er3+离子掺杂浓度从0.4 wt%增加到1.0 wt%时，中红外荧光强度相应增加，计算的Er3+∶4I11/2能级的多声子驰豫速率为37 s-1.

Abstract

In order to output the ideal infrared fluorescence matrix glass, a serial of chalcogenide glasses based on Ge-Ga-S-KBr system doped with different Er3+ concentrations are synthesized by a melt-quenching technique. The refractive indexes, absorption spectra, mid-infrared emission spectra of samples are measured. The oscillator strengths of absorption lines of Er3+ ions are calculated using the absorption spectra. The intensity parameters (Ωi,i=2,4,6), transition probabilities (A), branching ratios (β) are predicted for Er3+ ions in the samples using the Judd-Ofelt theory. The mid-infrared emission properties are investigated for the samples with the different Er3+ concentrations under 808 nm laser excitation. The 2.8 μm-emission cross-section is calculated using the theory of the Futchbauer- Ladenburg. The results indicate that the fluorescence under 808 nm excitation with peak wavelength at 2.8 μm is due to the Er3+∶4I11/2→4I13/2 transition. The intensity of the mid-infrared fluorescence is enhanced by increasing the concentration of the Er3+ from 0.4 wt% to 1.0 wt%. Multiphonon relaxation rate is estimated to be 37 s-1 for the Er3+∶4I11/2 level.

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黄正裕, 戴世勋, 孙高海, 徐铁峰, 聂秋华, 沈祥, 王训四. Er³⁺掺杂Ge-Ga-S-KBr硫卤玻璃的中红外发光和多声子弛豫的研究[J]. 光子学报, 2010, 39(8): 1466. HUANG Zheng-yu, DAI Shi-xun, SUN Gao-hai, XU Tie-feng, NIE Qiu-hua, SHEN Xiang, WANG Xun-si. Mid-infrared Emissions and Multiphonon Relaxation in Er³⁺-doped Chalcohalide Glasses[J]. ACTA PHOTONICA SINICA, 2010, 39(8): 1466.

Er³⁺掺杂Ge-Ga-S-KBr硫卤玻璃的中红外发光和多声子弛豫的研究

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