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Proceedings Paper

A quantum cascade laser based room temperature spectrometer for sensitive detection of ammonia and ethylene
Author(s): J. Manne; W. Jäger; J. Tulip
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Paper Abstract

We investigated the use of a pulsed, distributed feedback (DFB) quantum cascade (QC) laser centered at 970 cm-1 in combination with an astigmatic Herriot cell with 150 m path length for the detection of ammonia and ethylene. This spectrometer utilizes the intra-pulse method, where a linear frequency down-chirp, that is induced when a top-hat current pulse is applied to the laser, is used for sweeping across the absorption line. This provides a real time display of the spectral fingerprint of molecular gases, which can be a few wave numbers wide. A 200 ns long pulse was used for these measurements which resulted in a spectral window of ~1.74 cm-1. A room temperature mercury-cadmium-telluride detector was used, resulting in a completely cryogen free spectrometer. We demonstrated detection limits of ~3 ppb for ammonia and ~5 ppb for ethylene with less than 10 s averaging time.

Paper Details

Date Published: 12 February 2008
PDF: 8 pages
Proc. SPIE 6900, Quantum Sensing and Nanophotonic Devices V, 690014 (12 February 2008); doi: 10.1117/12.785478
Show Author Affiliations
J. Manne, Univ. of Alberta (Canada)
W. Jäger, Univ. of Alberta (Canada)
J. Tulip, Univ. of Alberta (Canada)

Published in SPIE Proceedings Vol. 6900:
Quantum Sensing and Nanophotonic Devices V
Rengarajan Sudharsanan; Christopher Jelen, Editor(s)

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