应用光学, 2018, 39 (5): 735, 网络出版: 2018-10-06   

基于中红外DFG光源的甲烷气体光谱检测方法研究

Research on methane gas spectroscopy detection method based on mid-infrared DFG laser source
作者单位
1 南京信息工程大学 江苏省大气环境与装备技术协同创新中心, 江苏 南京 210044
2 南京信息工程大学 江苏省气象探测与信息处理重点实验室, 江苏 南京 210044
摘要
基于中红外光源的气体光谱检测是新的痕量气体监测与分析方法, 在大气监测领域具有重要的应用。构建了一套基于中红外DFG光源的甲烷气体光谱检测系统。该系统以1 550 nm和1 060 nm波段可调谐半导体激光器作为基频光源, 采用PPLN晶体作为差频非线性变频器件, 实现了3.3 μm处的窄线宽可调谐中红外光源输出。实验结果表明, 当PPLN晶体工作温度为99.5℃时, 闲频光的输出功率为112 μW, 差频转换效率达到1.246 mW/W2。晶体的温度接受带宽为4.3℃, 泵浦光波长接受带宽为5.3 nm。在此基础上, 分别利用直接吸收法和谐波检测法获得了3 028.751 cm-1处的甲烷气体吸收光谱和二次谐波检测信号。
Abstract
Gas spectroscopy detection based on mid-infrared laser source has been applied in the field of atmospheric monitoring as a new method for measuring and analyzing trace gases.A detection system of methane gas based on mid-infrared difference-frequency generation (DFG) laser source was constructed.The system uses a tunable semiconductor laser with 1 550 nm and 1 060 nm band as the fundamental frequency source, and uses a periodically-poled lithium niobate (PPLN) crystal as the differential frequency nonlinear inverter to achieve a narrow linewidth tunable mid-infrared source output at 3.3 μm. Experimental results show that, when the temperature of the PPLN crystal is fixed at 99.5℃, the maximum idler laser output power of 112 μW , and the nonlinear DFG conversion efficiency is 1.246 mW/W2. The acceptance bandwidth for the pump wavelength and the crystal temperature are 5.3 nm and 4.3℃, respectively. On this basis, the methane gas absorption spectrum and the second harmonic detection signal at 3 028.751 cm-1 were obtained by direct absorption method and harmonic detection method, respectively.

房久龙, 常建华, 戴峰, 刘振兴, 豆晓雷, 赵勇毅. 基于中红外DFG光源的甲烷气体光谱检测方法研究[J]. 应用光学, 2018, 39(5): 735. Fang Jiulong, Chang Jianhua, Dai Feng, Liu Zhenxing, Dou Xiaolei, Zhao Yongyi. Research on methane gas spectroscopy detection method based on mid-infrared DFG laser source[J]. Journal of Applied Optics, 2018, 39(5): 735.

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