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Indirect mid-infrared optical feedback cavity-enhanced spectroscopy in a Brewster window cavity
Author(s): Jakob Hayden; Johannes P. Waclawek; Bernhard Lendl
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Paper Abstract

An optical setup for cavity enhanced mid-infrared photoacoustic spectroscopy is introduced. Optical feedback from a Brewster window cavity was utilized for efficient coupling of optical power from a distributed feedback quantum cascade laser into an optical cavity with a finesse of 1900, which led to intra-cavity optical power enhancement by a factor of 300. A custom quartz tuning fork was placed into the center of the cavity for intra-cavity quartz enhanced photoacoustic spectroscopy of CO at a wavelength of 4.59 μm. As compared to neighboring absorption lines of water, photoacoustic signals of CO were very weak due to slow vibrational to translational energy transfer. Signals increased sharply with increasing humidity. For humidified CO in N2 at near ambient pressure, a limit of detection (3 ο) of 8.4 ppbHz-1/2 was estimated.

Paper Details

Date Published: 1 February 2019
PDF: 7 pages
Proc. SPIE 10926, Quantum Sensing and Nano Electronics and Photonics XVI, 109262Q (1 February 2019); doi: 10.1117/12.2509588
Show Author Affiliations
Jakob Hayden, Technische Univ. Wien (Austria)
Johannes P. Waclawek, Technische Univ. Wien (Austria)
Bernhard Lendl, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 10926:
Quantum Sensing and Nano Electronics and Photonics XVI
Manijeh Razeghi; Jay S. Lewis; Eric Tournié; Giti A. Khodaparast, Editor(s)

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