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
Subject
Atomic and Molecular Physics, and Optics
Cited by
8 articles.
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