采用蒸馏提纯工艺制备了五组不同Er3+离子掺杂浓度的Ge-Ga-S-CsI玻璃样品, 测试了样品的折射率、红外透过光谱, 以及800nm激光泵浦下样品在2.85um处的中红外荧光光谱和荧光寿命, 计算了样品中OH-在3um处的红外吸收系数以及Er3+离子与OH-基团相互作用的强度参量KOH-Er, 讨论了OH-根杂质对样品中红外荧光特性的影响. 结果表明: 蒸馏提纯工艺能有效降低玻璃样品中的OH-残留量, 增强Er3+离子2.85um中红外荧光强度和荧光寿命. 计算得到KOH-Er值为1.08×10-16cm4/s, 由于Er3+离子与OH-之间单声子能量转移的高效性, 残存的少量OH?基团仍会影响2.85um荧光的强度.
A series of Er3+-doped chalcogenide glasses based on Ge-Ga-S-CsI system were prepared by melt-quenching technique with distillation processing. Properties including refractive index, infrared transmission spectra, 2.85um mid-infrared emission spectra and fluorescence lifetime under 800 nm laser excitation were measured. The infrared absorption coefficients of OH- groups at 3um according to the infrared transmission spectra were calculated, and the constant KOH-Er, determined by the strength of interactions between Er3+ ions and OH- groups in the case of energy transfer was also calculated. The effect of hydroxyl content on mid-infrared emission properties of glass samples was discussed. The results show that the remnants OH- content of glass samples can be effectively reduced by the distillation processing. The 2.85um mid-infrared fluorescence emission intensity and fluorescence lifetime of Er3+ ions are also enhanced. The calculated constant KOH-Er is about 1.08×10-16cm4/s. Because of the efficiency of energy transfer between Er3+ ions and OH- groups, the remnants of a small amount of OH- groups can still directly affect the intensity of 2.85um fluorescence.
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