QEPAS based detection of broadband absorbing molecules using a widely tunable, cw quantum cascade laser at 8.4 μm
Optics Express, Vol. 15, Issue 12, pp. 7357-7366 (2007)
http://dx.doi.org/10.1364/OE.15.007357
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Abstract
Detection of molecules with wide unresolved rotational-vibrational absorption bands is demonstrated by using Quartz Enhanced Photoacoustic Spectroscopy and an amplitude modulated, high power, thermoelectrically cooled quantum cascade laser operating at 8.4 μm in an external cavity configuration. The laser source exhibits single frequency tuning of 135 cm-1 with a maximum optical output power of 50 mW. For trace-gas detection of Freon 125 (pentafluoroethane) at 1208.62 cm-1 a normalized noise equivalent absorption coefficient of NNEA=2.64×10-9 cm-1∙W/Hz1/2 was obtained. Noise equivalent sensitivity at ppbv level as well as spectroscopic chemical analysis of a mixture of two broadband absorbers (Freon 125 and acetone) with overlapping absorption spectra were demonstrated.
© 2007 Optical Society of America
OCIS Codes
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(140.3600) Lasers and laser optics : Lasers, tunable
(300.6390) Spectroscopy : Spectroscopy, molecular
(300.6430) Spectroscopy : Spectroscopy, photothermal
ToC Category:
Lasers and Laser Optics
History
Original Manuscript: April 19, 2007
Revised Manuscript: May 24, 2007
Manuscript Accepted: May 24, 2007
Published: May 31, 2007
Citation
Rafal Lewicki, Gerard Wysocki, Anatoliy A. Kosterev, and Frank K. Tittel, "QEPAS based detection of broadband absorbing molecules using a widely tunable, cw quantum cascade laser at 8.4 μm," Opt. Express 15, 7357-7366 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-12-7357
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