Abstract

We 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 $f_0=2.68\mathrm{kHz}$) 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 (${\mathrm{C}}_2{\mathrm{H}}_2$) 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 ${\mathrm{C}}_2{\mathrm{H}}_2$ concentration and a minimum detection limit of 390 ppbv at 2-s response time.

© 2017 Optical Society of America

Ultrasensitive photoacoustic detection in a high-finesse cavity with Pound–Drever–Hall locking

Zhen Wang, Qiang Wang, Weipeng Zhang, Haoyun Wei, Yan Li, and Wei Ren
Opt. Lett. 44(8) 1924-1927 (2019)

Differential integrating sphere-based photoacoustic spectroscopy gas sensing

Chu Zhang, Ying He, Shunda Qiao, and Yufei Ma
Opt. Lett. 48(19) 5089-5092 (2023)

Trace gas sensing based on single-quartz-enhanced photoacoustic–photothermal dual spectroscopy

Shunda Qiao, Ying He, and Yufei Ma
Opt. Lett. 46(10) 2449-2452 (2021)

All-fiber gas sensor with intracavity photothermal spectroscopy

Yan Zhao, Wei Jin, Yuechuan Lin, Fan Yang, and Hoi Lut Ho
Opt. Lett. 43(7) 1566-1569 (2018)

Multi-pass quartz-enhanced photoacoustic spectroscopy-based trace gas sensing

Shunda Qiao, Yufei Ma, Pietro Patimisco, Angelo Sampaolo, Ying He, Ziting Lang, Frank K. Tittel, and Vincenzo Spagnolo
Opt. Lett. 46(5) 977-980 (2021)