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Proceedings Paper

CW DFB RT diode laser based sensor for trace-gas detection of ethane using novel compact multipass gas absorption cell
Author(s): Mohammad Jahjah; Rafal Lewicki; Frank K. Tittel; Karol Krzempek; Przemyslaw Stefanski; Stephen So; David Thomazy
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Paper Abstract

The development of a continuous wave (CW), thermoelectrically cooled (TEC), distributed feedback (DFB) laser diode based spectroscopic trace-gas sensor for ultra sensitive and selective ethane (C2H6) concentration measurements is reported. The sensor platform used tunable laser diode absorption spectroscopy (TDLAS) and wavelength modulation spectroscopy (WMS) as the detection technique. TDLAS was performed with an ultra-compact 57.6 m effective optical path length innovative spherical multipass cell capable of 459 passes between two mirrors separated by 12.5 cm. For an interference free C2H6 absorption line located at 2976.8 cm-1 a 1σ minimum detection limit of 130 pptv with a 1 second lock-in amplifier time constant was achieved.

Paper Details

Date Published: 4 February 2013
PDF: 7 pages
Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 86312G (4 February 2013); doi: 10.1117/12.2004528
Show Author Affiliations
Mohammad Jahjah, Rice Univ. (United States)
Rafal Lewicki, Rice Univ. (United States)
Frank K. Tittel, Rice Univ. (United States)
Karol Krzempek, Wroclaw Univ. of Technology (Poland)
Przemyslaw Stefanski, Wroclaw Univ. of Technology (Poland)
Stephen So, Sentinel Photonics (United States)
David Thomazy, Sentinel Photonics (United States)

Published in SPIE Proceedings Vol. 8631:
Quantum Sensing and Nanophotonic Devices X
Manijeh Razeghi, Editor(s)

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