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1 February 2019 Indirect mid-infrared optical feedback cavity-enhanced spectroscopy in a Brewster window cavity
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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.
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Jakob Hayden, Johannes P. Waclawek, and Bernhard Lendl "Indirect mid-infrared optical feedback cavity-enhanced spectroscopy in a Brewster window cavity", Proc. SPIE 10926, Quantum Sensing and Nano Electronics and Photonics XVI, 109262Q (1 February 2019); doi: 10.1117/12.2509588; https://doi.org/10.1117/12.2509588
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