基于中红外DFG光源的甲烷气体光谱检测方法研究 |
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引用本文: | 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): 735-742. DOI: 10.5768/JAO201839.0506001 |
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作者姓名: | 房久龙 常建华 戴峰 刘振兴 豆晓雷 赵勇毅 |
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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 |
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基金项目: | 国家自然科学基金11374161江苏省重点研发计划BE2016756江苏省高校品牌专业建设工程资助项目201610300030国家级大学生实践创新训练计划项目201710300015Z |
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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。
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关 键 词: | 中红外 甲烷气体 差频产生 直接吸收 二次谐波检测 |
收稿时间: | 2018-05-15 |
Research on methane gas spectroscopy detection method based on mid-infrared DFG laser source |
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Affiliation: | 1.Jiangsu Provincial Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, anjing University of Information Science & Technology, Nanjing 210044, China2.Jiangsu Provincial Key Laboratory of Meteorological Observation and Information Processing, Nanjing University of Information Science & Technology, Nanjing 210044, China |
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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. |
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