Open AccessPolarization impedance measurement cavity enhanced laser absorption spectroscopy
Author(s) -
Ya J. Guan,
Chathura P. Bandutunga,
Jiahao Dong,
Thanh Lam,
Roland Fleddermann,
Malcolm B. Gray,
J. H. Chow
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.435976
Subject(s) - optics , tunable diode laser absorption spectroscopy , cavity ring down spectroscopy , birefringence , materials science , polarization (electrochemistry) , absorption spectroscopy , laser , absorption (acoustics) , spectroscopy , optical cavity , tunable laser , physics , chemistry , quantum mechanics
We present a theoretical overview and experimental demonstration of a continuous-wave, cavity-enhanced optical absorption spectrometry method to detect molecular gas. This technique utilizes the two non-degenerate polarization modes of a birefringent cavity to obtain a zero background readout of the intra-cavity absorption. We use a double-pass equilateral triangle optical cavity design with additional feed-forward frequency noise correction to measure the R14e absorption line in the 30012←00001 band of CO 2 at 1572.655 nm. We demonstrate a shot noise equivalent absorption of 3 × 10 -13 cm -1 Hz -1/2 .