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31 January 2014 Cavity and quartz enhanced photo-acoustic mid-IR sensor
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We report on a novel intracavity quartz enhanced photoacoustic (I-QEPAS) gas sensing technique taking advantage from both the high Q-factor of standard tuning forks and the power build-up of a high-finesse optical resonator. This first prototype employs a distributed feedback quantum cascade laser operating at 4.3 μm. CO2 has been selected as gas target. Preliminary results demonstrate an improved sensitivity, close to the cavity enhancement factor (500) times the optical coupling efficiency (about 0.5), with respect to standard QEPAS technique. The detection limit was pulled from 7 ppm (obtained with standard QEPAS) down to 32 ppb, corresponding to normalized noise-equivalent absorption in the 10-9 W•cm-1•Hz-1/2 range.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
P. Patimisco, S. Borri, G. Scamarcio, V. Spagnolo, I. Galli, G. Giusfredi, D. Mazzotti, and P. De Natale "Cavity and quartz enhanced photo-acoustic mid-IR sensor", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899321 (31 January 2014);

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