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

Author:

Yang Nana12,Fang Bo1,Zhao Weixiong1ORCID,Wang Chunhui12,Cheng Feihu1,Hu Xiao12,Chen Yang12,Zhang Weijun12,Ma Weiguang3ORCID,Zhao Gang3ORCID,Chen Weidong4

Affiliation:

1. Chinese Academy of Sciences

2. University of Science and Technology of China

3. Shanxi University

4. Université du Littoral Côte d’Opale

Abstract

We report the development of an optical-feedback cavity-enhanced absorption spectroscopy (OF-CEAS) instrument for OH detection at 2.8 μm 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 1.7×10−9 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 ∼ 2×108 molecule/cm3. Further improvement can be achieved by using higher reflectivity mirrors and other high-sensitivity approaches, such as frequency modulation spectroscopy and Faraday rotation spectroscopy.

Funder

National Natural Science Foundation of China

the Second Tibetan Plateau Scientific Expedition and Research program

Youth Innovation Promotion Association

the HFIPS Director’s Fund

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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