Difference-Frequency-Based Laser Spectrometer for Trace CH4 Detection

摘要：

A laser spectrometer based on difference-frequency generation in periodically poled LiNbO3 (PPLN) has been developed. The mid-infrared laser source was pumped by complementally two commercial narrow linewidth diode laser, to produce about lμm of output power in the tuning region from 3.2um to 3.7μm. The spectrometer was used for trace CH4 measurement, a CH4 absorption line at 3028.751 cm-1 of V3 band was chosen as this line is relatively free of interference by other gas species. The selected absorption line was verified using a single-pass cell detection. The detection sensitivity is estimated to be 0.8ppm for 10cm optical path length at atmospheric pressure, and is limited mainly by the etalon noise of optical surfaces.

关键词： Difference-frequency generation (DFG) Methane(CH4) Mid-infrared laser spectroscopy spectrometer)

作者: Dong Chen Wenqing Liu Yujun Zhang

作者单位: School of Instrument Science and Opto-electronic Engineering, Hefei University of Technology,Hefei A Anhui Institute of Optics and Fine Mechanics, CAS , Hefei Anhui, China Anui Institute of Optics and Fine Mechanics, CAS , Hefei Anhui, China

会议类型: 国际会议

会议名称: 2011 International Conference on Electronics and Optoelectronics(2011电子学与光电子学国际会议 ICEOE 2011)

会议地点: 大连

会议语种:英文

页码: 479-481

在线出版日期: 2011-07-29（万方平台首次上网日期，不代表论文的发表时间）