Scientific Results

Intracavity quartz-enhanced photoacoustic sensor

Year: 2014

Authors: Borri S., Patimisco P., Galli I., Mazzotti D., Giusfredi G., Akikusa N., Yamanishi M., Scamarcio G., De Natale P., Spagnolo V.

Autors Affiliation: CNR-INO UOS Sesto Fiorentino and LENS, via Carrara 1, 50019 Sesto Fiorentino FI, Italy; CNR-IFN UOS Bari and Dipartimento Interateneo di Fisica, Universita degli Studi di Bari e Politecnico di Bari, via Amendola 173, 70126 Bari BA, Italy; Development Bureau Laser Device R&D Group, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan; Central Research Laboratories, Hamamatsu Photonics KK, Shizuoka 434-8601, Japan

Abstract: We report on a spectroscopic technique named intracavity quartz-enhanced photoacoustic spectroscopy (I-QEPAS) employed for sensitive trace-gas detection in the mid-infrared spectral region. It is based on a combination of QEPAS with a buildup optical cavity. The sensor includes a distributed feedback quantum cascade laser emitting at 4.33 mu m. We achieved a laser optical power buildup factor of similar to 500, which corresponds to an intracavity laser power of similar to 0.75 W. CO2 has been selected as the target molecule for the I-QEPAS demonstration. We achieved a detection sensitivity of 300 parts per trillion for 4 s integration time, corresponding to a noise equivalent absorption coefficient of 1.4 x 10(-8) cm(-1) and a normalized noise-equivalent absorption of 3.2 x 10(-10) W cm(-1) Hz(-1/2). (C) 2014 AIP Publishing LLC.

Journal/Review: APPLIED PHYSICS LETTERS

Volume: 104 (9)      Pages from: 091114  to: 091114

More Information: This work was financially supported by the Italian Ministry for University and Research through the Italian national Project Nos. PON01_02238, PON02_00675, PON02_00576, by the project \”Active Ageing@home\” within the National Technological Cluster (CTN) venture in the PON-2013-FESR framework, and by the Laserlab-Europe consortium within the Joint Research Activity 2012-2015 JRA4: EURO-LITE.
KeyWords: Absorption co-efficient; Detection sensitivity; Distributed feedback; Mid-infrared spectral regions; Photoacoustic sensors; Quartz-enhanced photoacoustic spectroscopies; Spectroscopic technique; Trace gas detection, Carbon dioxide; Quantum cascade lasers; Quartz, Sensors
DOI: 10.1063/1.4867268

Citations: 52
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English