Optical-feedback cavity-enhanced absorption spectroscopy for OH radical detection at 2.8 μm using a DFB diode laser

被引：10
|
作者：
Yang, Nana [1 ,2 ]
Fang, Bo [1 ]
Zhao, Weixiong [1 ]
Wang, Chunhui [1 ,2 ]
Cheng, Feihu [1 ]
Hu, Xiao [1 ,2 ]
Chen, Yang [1 ,2 ]
Zhang, Weijun [1 ,2 ]
Ma, Weiguang [3 ]
Zhao, Gang [3 ]
Chen, Weidong [4 ]
机构：
[1] Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Physicochem, HFIPS, Hefei 230031, Anhui, Peoples R China
[2] Univ Sci & Technol China, Hefei 230026, Anhui, Peoples R China
[3] Shanxi Univ, Inst Laser Spect, State Key Lab Quantum Opt & Quantum Opt Devices, Taiyuan 030006, Peoples R China
[4] Univ Littoral Cote dOpale, Lab Phys Chim Atmosphere, F-59140 Dunkerque, France
来源：
OPTICS EXPRESS | 2022年 / 30卷 / 09期
基金：
中国国家自然科学基金;
关键词：
QUANTUM CASCADE LASER; FREQUENCY STABILIZATION; OF-CEAS; SPECTROMETER; CH4; REACTIVITY; NOISE; TOOL;
D O I：
10.1364/OE.456648
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report the development of an optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) instrument for OH detection at 2.8 mu m using a DFB diode laser. Two different approaches, symmetry analysis and wavelength modulation, were performed to achieve laser frequency locking to the cavity mode. Compared with the symmetry analysis method, the wavelength modulation method continuously locked the laser frequency to the cavity mode and eliminated decoupling the laser from the cavity mode. A detection sensitivity of 1.7x10(-9) cm(-1) was achieved in a 25 s sampling time and was about 3 times better than that of the symmetry analysis method. The corresponding OH detection limit was similar to 2x10(8) molecule/cm(3). Further improvement can be achieved by using higher reflectivity mirrors and other high-sensitivity approaches, such as frequency modulation spectroscopy and Faraday rotation spectroscopy. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码：15238 / 15249
页数：12
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