31 January 2014 THz quartz-enhanced photoacoustic sensor employing a quantum cascade laser source
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
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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