Fiber-ring laser-based intracavity photoacoustic spectroscopy for trace gas sensing
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AbstractWe demonstrated a novel trace gas sensing method based on fiber-ring laser intracavity photoacoustic spectroscopy. This spectroscopic technique is a merging of photoacoustic spectroscopy (PAS) with a fiber-ring cavity for sensitive and all-fiber gas detection. A transmission-type PAS gas cell (resonant frequency f(0) = 2.68 kHz) was placed inside the fiber-ring laser to fully utilize the intracavity laser power. The PAS signal was excited by modulating the laser wavelength at f 0/ 2 using a custom-made fiber Bragg grating-based modulator. We used this spectroscopic technique to detect acetylene (C2H2) at 1531.6 nm as a proof of principle. With a low Q-factor (4.9) of the PAS cell, our sensor achieved a good linear response (R-2 = 0.996) to C2H2 concentration and a minimum detection limit of 390 ppbv at 2-s response time. (C) 2017 Optical Society of America
All Author(s) ListQiang Wang , Zhen Wang , Jun Chang , Wei Ren
Journal nameOptics Letters
Year2017
Month6
Day1
Volume Number42
Issue Number11
PublisherOPTICAL SOC AMER
Pages2114 - 2117
ISSN0146-9592
eISSN1539-4794
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesOptics;Optics

Last updated on 2020-31-07 at 23:14