Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

doi:10.1088/1009-1963/14/9/040

中国物理B ›› 2005, Vol. 14 ›› Issue (9): 1904-1909.doi: 10.1088/1009-1963/14/9/040

Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

阚瑞峰¹, 董凤忠¹, 张玉钧¹, 刘建国¹, 王敏¹, 高山虎¹, 陈军¹, 刘诚²

(1)Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; (2)University of Science and Technology of China, Hefei 230026, China

收稿日期:2004-12-28 修回日期:2005-05-07 出版日期:2005-09-20 发布日期:2005-09-20
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No 10274080) and the National High Technology Research and Development Program of China (Grant No 2003AA641010).

Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

Kan Rui-Feng (阚瑞峰)^a, Dong Feng-Zhong (董凤忠)^a, Zhang Yu-Jun (张玉钧)^a, Liu Jian-Guo (刘建国)^a, Liu Cheng (刘诚)^b, Wang Min (王敏)^a, Gao Shan-Hu (高山虎)^a, Chen Jun (陈军)^a

^a Key Laboratory of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China; ^b University of Science and Technology of China, Hefei 230026, China

Received:2004-12-28 Revised:2005-05-07 Online:2005-09-20 Published:2005-09-20
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No 10274080) and the National High Technology Research and Development Program of China (Grant No 2003AA641010).

摘要/Abstract

摘要： Tunable diode laser absorption spectroscopy (TDLAS) has been widely employed in atmospheric trace gases detection. The ratio of the second-harmonic signal to the intensity of laser beam incident to the multi-pass cell is proved to be proportional to the product of the path length and the gas concentration under any condition. A new calibration method based on this relation in TDLAS system for the measurement of trace gas concentration is proposed for the first time. The detection limit and the sensitivity of the system are below 110 and 31ppbv (parts-per-billion in volume), respectively.

关键词: tunable diode laser absorption spectroscopy, multi-pass cell, harmonic detection, wave-length modulation

Abstract: Tunable diode laser absorption spectroscopy (TDLAS) has been widely employed in atmospheric trace gases detection. The ratio of the second-harmonic signal to the intensity of laser beam incident to the multi-pass cell is proved to be proportional to the product of the path length and the gas concentration under any condition. A new calibration method based on this relation in TDLAS system for the measurement of trace gas concentration is proposed for the first time. The detection limit and the sensitivity of the system are below 110 and 31ppbv (parts-per-billion in volume), respectively.

Key words: tunable diode laser absorption spectroscopy, multi-pass cell, harmonic detection, wave-length modulation

中图分类号: (Beam characteristics: profile, intensity, and power; spatial pattern formation)

42.60.Jf

42.55.Px (Semiconductor lasers; laser diodes) 42.60.Fc (Modulation, tuning, and mode locking)

阚瑞峰, 董凤忠, 张玉钧, 刘建国, 刘诚, 王敏, 高山虎, 陈军. Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy[J]. 中国物理B, 2005, 14(9): 1904-1909.

Kan Rui-Feng (阚瑞峰), Dong Feng-Zhong (董凤忠), Zhang Yu-Jun (张玉钧), Liu Jian-Guo (刘建国), Liu Cheng (刘诚), Wang Min (王敏), Gao Shan-Hu (高山虎), Chen Jun (陈军). Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy[J]. Chinese Physics, 2005, 14(9): 1904-1909.

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Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

Influence of laser intensity in second-harmonic detection with tunable diode laser multi-pass absorption spectroscopy

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