THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source

V. Spagnolo; P. Patimisco; S. Borri; A. Sampaolo; G. Scamarcio; M. S. Vitiello; H. E. Beere; D. A. Ritchie

doi:10.1117/12.2033620

31 January 2014 THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source

V. Spagnolo, P. Patimisco, S. Borri, A. Sampaolo, G. Scamarcio, M. S. Vitiello, H. E. Beere, D. A. Ritchie

Proceedings Volume 8993, Quantum Sensing and Nanophotonic Devices XI; 899320 (2014) https://doi.org/10.1117/12.2033620
Event: SPIE OPTO, 2014, San Francisco, California, United States

Abstract

We report on an innovative quartz enhanced photoacoustic (QEPAS) gas sensor operating in the THz spectral range, employing a custom quartz tuning fork (QTF) with the two prongs spaced by ~800 μm. To test our sensor we employed a quantum cascade laser light source and selected a methanol rotational absorption line falling at 131.054 cm^-1 (~3.93 THz), with line-strength S = 4.28•10^-21 cm. The sensor operated at 10 Torr pressure on the QTF first flexion resonance frequency at 4245 Hz. We achieved a QEPAS normalized noise-equivalent absorption of 2•10^-10 W·cm^-1•Hz^-1/2 comparable with the best result of mid-IR QEPAS systems.

Citation Download Citation

V. Spagnolo, P. Patimisco, S. Borri, A. Sampaolo, G. Scamarcio, M. S. Vitiello, H. E. Beere, and D. A. Ritchie "THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 899320 (31 January 2014); https://doi.org/10.1117/12.2033620

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