Optical-feedback cavity ring-down spectroscopy for NO 2 extinction coefficient measurement using a continuous wave laser diode

Optical-feedback (OF) cavity ring-down spectroscopy consisting of a linear cavity is developed by employing a continuous wave laser diode (LD) with multi-longitudinal modes. Due to the OF effect caused by the cavity output laser back into the LD, the laser frequency is locked, and the intracavity la...

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Bibliographic Details
Published in:Applied optics (2004) 2022-03, Vol.61 (9), p.2230
Main Authors: Cheng, Chonghui, Liu, Sumei, Qi, Haiyang, Hu, Pengbing, Ye, Pei, Pan, Sunqiang
Format: Article
Language:English
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Summary:Optical-feedback (OF) cavity ring-down spectroscopy consisting of a linear cavity is developed by employing a continuous wave laser diode (LD) with multi-longitudinal modes. Due to the OF effect caused by the cavity output laser back into the LD, the laser frequency is locked, and the intracavity laser intensity is enhanced. We use different concentrations of gases to test the apparatus, and the results show good agreement with theoretical values. Owing to the compactness of the laser source and high detection accuracy, the device can be used for detection of low-concentration absorbent gases in the environmental monitoring field.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.450874