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
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.
Received: 28 December 2004
Revised: 07 May 2005
Accepted manuscript online:
PACS:
42.60.Jf
(Beam characteristics: profile, intensity, and power; spatial pattern formation)
Fund: 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).
Cite this article:
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 2005 Chinese Physics 14 1904
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