31 January 2014 Cavity and quartz enhanced photo-acoustic mid-IR sensor
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Abstract
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.
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P. Patimisco, P. Patimisco, S. Borri, S. Borri, G. Scamarcio, G. Scamarcio, V. Spagnolo, V. Spagnolo, I. Galli, I. Galli, G. Giusfredi, G. Giusfredi, D. Mazzotti, D. Mazzotti, P. De Natale, 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); doi: 10.1117/12.2042246; https://doi.org/10.1117/12.2042246
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