Cavity and quartz enhanced photo-acoustic mid-IR sensor

P. Patimisco; S. Borri; G. Scamarcio; V. Spagnolo; I. Galli; G. Giusfredi; D. Mazzotti; P. De Natale

doi:10.1117/12.2042246

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31 January 2014 Cavity and quartz enhanced photo-acoustic mid-IR sensor

P. Patimisco, S. Borri, G. Scamarcio, V. Spagnolo, I. Galli, G. Giusfredi, D. Mazzotti, P. De Natale

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Proceedings Volume 8993, Quantum Sensing and Nanophotonic Devices XI; 899321 (2014) https://doi.org/10.1117/12.2042246
Event: SPIE OPTO, 2014, San Francisco, California, United States

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, 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); https://doi.org/10.1117/12.2042246

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