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J. Hayden, M. Giglio, A. Sampaolo, P. Patimisco, V. Spagnolo, B. Lendl:
"Intracavity quartz-enhanced photoacoustic spectroscopy for CO/ N2O detection in the part-per-trillion concentration range";
in: "Proc. SPIE 11288, Quantum Sensing and Nano Electronics and Photonics XVII, 1128821", herausgegeben von: SPIE; SPIEdigitallibrary, USA, 2020, S. 1128821-1 - 1128821-6.

A mid-infrared gas sensor based on intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) and a custom
quartz tuning fork is here reported. A 4.59 μm distributed feedback quantum cascade laser was optically coupled into a
high-finesse Brewster window linear optical cavity. A power enhancement factor of ~ 250 has been achieved. A
spectrophone composed of a custom tuning fork having 1.5 mm prong spacing, acoustically coupled with a pair of
micro-resonator tubes, was placed in the focal point of the high-finesse cavity. The sensor was calibrated for humidified
carbon monoxide and nitrous oxide detection. Gas concentration sensitivities in the part-per-trillion range were achieved
for both gas species.

http://dx.doi.org/10.1117/12.2545796