Polarization impedance measurement cavity enhanced laser absorption spectroscopy Article Swipe

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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 Physical chemistry

Yizhang Guan , Chathura P. Bandutunga , Jiahao Dong , Timothy T.-Y. Lam , Roland Fleddermann , Malcolm B. Gray , J. H. Chow ·

YOU? · · 2021 · Open Access · · DOI: https://doi.org/10.1364/oe.435976 · OA: W3203657162

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 .