31 January 2014 THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source
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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.
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V. Spagnolo, V. Spagnolo, P. Patimisco, P. Patimisco, S. Borri, S. Borri, A. Sampaolo, A. Sampaolo, G. Scamarcio, G. Scamarcio, M. S. Vitiello, M. S. Vitiello, H. E. Beere, H. E. Beere, D. A. Ritchie, 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); doi: 10.1117/12.2033620; https://doi.org/10.1117/12.2033620
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