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1.中国科学院 合肥物质科学研究院 安徽光学精密机械研究所,安徽 合肥230031
2.中国科学技术大学,安徽 合肥 230026
3.中国科学院 长春光学精密机械与物理研究所,吉林 长春 130033
4.哈尔滨工业大学 可调谐激光技术国家级重点实验室,黑龙江 哈尔滨 150001
[ "胡 迈(1988-),男,湖南岳阳人,博士研究生,2012年、2015年于长春理工大学分别获得学士、硕士学位,主要从事红外吸收光谱方面的研究。E-mail: humai1111@163.com" ]
[ "阚瑞峰(1977-),男,辽宁锦州人,博士,研究员,2000年于长春理工大学获得学士学位;2003年、2006年于中科院安徽光机所分别获得硕士与博士学位,主要从事光学与光谱学方面的研究。E-mail: kanruifeng@aiofm.ac.cn" ]
收稿日期:2021-08-27,
修回日期:2021-10-11,
纸质出版日期:2022-02-25
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胡迈,陈祥,张辉等.一次谐波锁频的快速光腔衰荡光谱检测[J].光学精密工程,2022,30(04):363-371.
HU Mai,CHEN Xiang,ZHANG Hui,et al.Fast optical cavity ring-down spectroscopy detection based on first harmonic frequency locking[J].Optics and Precision Engineering,2022,30(04):363-371.
胡迈,陈祥,张辉等.一次谐波锁频的快速光腔衰荡光谱检测[J].光学精密工程,2022,30(04):363-371. DOI: 10.37188/OPE.20223004.0363.
HU Mai,CHEN Xiang,ZHANG Hui,et al.Fast optical cavity ring-down spectroscopy detection based on first harmonic frequency locking[J].Optics and Precision Engineering,2022,30(04):363-371. DOI: 10.37188/OPE.20223004.0363.
本文介绍了一种赫兹级响应速率的光腔衰荡光谱探测大气痕量气体的检测技术。将100 MHz正弦波调制信号加载在电光相位调制器上产生边带,用混频器提取载波与边带通过3 m气体吸收池后拍频所产生的一次谐波作为误差信号,实现了1 572 nm分布式反馈激光器对于二氧化碳气体分子6 361.25 cm
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1
处超精细跃迁线的频率锁定。采用波分复用方法对空腔衰荡时间和有气体吸收时的衰荡时间进行同时测量,在330 mm光学谐振腔上得到了4.82×10
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10
cm
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的系统检测限。在较大的二氧化碳浓度范围内,系统具有良好的线性响应,线性相关系数大于0.999 9。系统长时间的观测结果与Picarro商用仪器的数据高度吻合,二者偏差小于1.0%。该系统论证了一次谐波锁定激光频率至分子超精细跃迁线并用于光腔衰荡光谱系统实现快速痕量气体检测的可行性。
Optical cavity ring-down spectroscopy with a Hz-level response rate is introduced to detect trace gases in the atmosphere. By loading a 100 MHz modulated sine wave signal on the electro-optic phase modulator that generates sidebands and using the mixer to extract the first harmonic generated as the error signal by the beat frequency of the carrier and sidebands after passing through the 3 m gas absorption cell, the frequency locking of a 1 572 nm distributed feedback laser on the 6 361.25 cm
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1
hyperfine transition line of carbon dioxide gas molecule was achieved. The ring-down time of the cavity without gas and the ring-down time with gas absorption were simultaneously measured using the wavelength-division multiplexing method, and the detection limit of the system obtained was 4.82×10
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10
cm
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1
on a 330 mm optical resonator. The system has a good linear response in a large carbon dioxide concentration range, and the linear correlation coefficient is greater than 0.999. The long-term observation results of the system are highly consistent with the data from Picarro commercial instruments, and the deviation between the two is less than 1.0%. The system proved the feasibility of locking the laser frequency to the molecular hyperfine transition line using the first harmonic and applying it to the optical cavity ring-down spectroscopy system to achieve a fast trace gas detection.
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