Using Polarization to Measure Absorption in Cavity Enhanced Spectroscopy

Yajie Guan; Yajie Guan; Chathura Bandutunga; Chathura Bandutunga; Malcolm B. Gray; Malcolm B. Gray; Jong H. Chow; Jong H. Chow

doi:10.1364/ES.2021.ETh1A.3

OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES)
OSA Technical Digest (Optica Publishing Group, 2021),
paper ETh1A.3
•https://doi.org/10.1364/ES.2021.ETh1A.3

Using Polarization to Measure Absorption in Cavity Enhanced Spectroscopy

Yajie Guan, Chathura Bandutunga, Malcolm B. Gray, and Jong H. Chow

Optics and Photonics for Sensing the Environment 2021

Washington, DC United States
19–23 July 2021
ISBN: 978-1-943580-90-3

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Y. Guan, C. Bandutunga, M. B. Gray, and J. H. Chow, "Using Polarization to Measure Absorption in Cavity Enhanced Spectroscopy," in OSA Optical Sensors and Sensing Congress 2021 (AIS, FTS, HISE, SENSORS, ES), S. Buckley, F. Vanier, S. Shi, K. Walker, I. Coddington, S. Paine, K. Lok Chan, W. Moses, S. Qian, P. Pellegrino, F. Vollmer, G. , J. Jágerská, R. Menzies, L. Emmenegger, and J. Westberg, eds., OSA Technical Digest (Optica Publishing Group, 2021), paper ETh1A.3.

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Abstract

We present a method using polarization for molecular absorption readout in a cavity enhanced spectrometer. We demonstrate a double-pass cavity configuration with CO2, attaining a quantum noise-equivalent absorption sensitivity of ~3x10^-13 /Hz /cm.

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