实验制备了Er3+掺杂质量分数为1%的Ga5Ge20Sb10S65硫系玻璃,测试了其折射率、吸收光谱和荧光光谱,利用Judd-Ofelt和Futchbauer-Ladenburg理论计算了Er3+离子的自发辐射几率、吸收截面和受激发射截面等光谱参数。在综合考虑Er3+离子的交叉弛豫、能量上转换和激发态吸收效应的基础上,应用四能级粒子数速率-光功率传输方程模型,模拟计算了Er3+掺杂Ga5Ge20Sb10S65硫系玻璃光纤的中红外2.74μm波段的增益特性。结果显示,Er3+掺杂硫系玻璃光纤在2.74μm中红外波段具有较高的信号增益和较宽的增益谱,最大增益值和20dB增益带宽分别超过了40dB和200nm,表明其是可用于中红外2.74μm波段宽带放大的理想增益介质。 The Er3 + doped Ga5Ge20Sb10S65 chalcogenide glass with 1% mass fraction was prepared and its refractive index, absorption and fluorescence spectra were tested. The spontaneous emission of Er3 + Stimulated emission cross section and other spectral parameters. Based on the consideration of the cross-relaxation, energy upconversion and excited-state absorption of Er3 + ion, the model of four-level particle velocity-optical power transfer equation was used to simulate the mid-infrared 2.74μm band gain characteristics. The results show that the Er3 + doped chalcogenide glass fiber has higher signal gain and wider gain spectrum in the 2.74μm mid-infrared band, and the maximum gain value and 20dB gain bandwidth exceed 40dB and 200nm, respectively, indicating that it is useful for mid-infrared 2.74μm band broadband amplification of the ideal gain medium.