| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 15, Number 1, 2019
|
|
|---|---|---|
| Article Number | 23 | |
| Number of page(s) | 9 | |
| DOI | https://doi.org/10.1186/s41476-019-0120-5 | |
| Published online | 29 October 2019 | |
Research
Study of a periodic spectral fluctuation existing in a fibered optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS)
Department of Optoelectronic Engineering, College of Advanced Interdisciplinary Studies, National University of Defense Technology, No. 1, Deya Road, Kaifu District, 410073, Changsha, Hunan, China
Received:
26
July
2019
Accepted:
4
October
2019
A special periodic spectral fluctuation is observed during the study of a fibered high sensitivity optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) for the measurement of trace gas. This spectral fluctuation is different from some phenomenon observed in former OF-CEAS which contain a resonant cavity with V-shaped configuration, such as the etalon effect and the spectral ripple effect. To reveal why this phenomenon happens and how it works, a series of hypothesis are proposed and tested, and the results show that the multi-beam interference of resonance light at the input mirror of the resonant cavity is the main reason for this phenomenon. Based on the multi-beam interference theory, a mathematical modeling of this phenomenon is built, and the theoretical analyses agree well with the experimental results. Some methods to eliminate this phenomenon are proposed and implemented, and the 1σ noise equivalent absorption coefficient of 7.6 × 10− 10 cm− 1 Hz-1/2 is attained with this robust and compact OF-CEAS system.
Key words: Optical feedback / Spectral fluctuation / Cavity-enhanced absorption spectroscopy / Human breath analysis
© The Author(s) 2019
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
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