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Proceedings Paper

Cavity and quartz enhanced photo-acoustic mid-IR sensor
Author(s): P. Patimisco; S. Borri; G. Scamarcio; V. Spagnolo; I. Galli; G. Giusfredi; D. Mazzotti; P. De Natale
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Paper 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.

Paper Details

Date Published: 31 January 2014
PDF: 8 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899321 (31 January 2014); doi: 10.1117/12.2042246
Show Author Affiliations
P. Patimisco, Rice Univ. (Italy)
Univ. degli Studi di Bari (Italy)
S. Borri, Istituto Nazionale di Ottica, CNR (Italy)
European Lab. for Non-linear Spectroscopy (Italy)
G. Scamarcio, Univ. degli Studi di Bari (Italy)
V. Spagnolo, Univ. degli Studi di Bari (Italy)
I. Galli, Istituto Nazionale di Ottica, CNR (Italy)
European Lab. for Non-linear Spectroscopy (Italy)
G. Giusfredi, Istituto Nazionale di Ottica, CNR (Italy)
European Lab. for Non-linear Spectroscopy (Italy)
D. Mazzotti, Istituto Nazionale di Ottica, CNR (Italy)
European Lab. for Non-linear Spectroscopy (Italy)
P. De Natale, Istituto Nazionale di Ottica, CNR (Italy)
European Lab. for Non-linear Spectroscopy (Italy)


Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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