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Optics Letters

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  • Vol. 36, Iss. 11 — Jun. 1, 2011
  • pp: 1951–1953

Atmospheric observations of multiple molecular species using ultra-high-resolution external cavity quantum cascade laser heterodyne radiometry

Damien Weidmann, Tracy Tsai, Neil A. Macleod, and Gerard Wysocki  »View Author Affiliations


Optics Letters, Vol. 36, Issue 11, pp. 1951-1953 (2011)
http://dx.doi.org/10.1364/OL.36.001951


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Abstract

We demonstrate a widely tunable laser heterodyne radiometer operating in the thermal IR during an atmospheric observation campaign in the solar occultation viewing mode. An external cavity quantum cascade laser tunable within a range of 1120 to 1238 cm 1 is used as the local oscillator (LO) of the instrument. Ultra-high-resolution ( 60 MHz or 0.002 cm 1 ) transmission spectroscopy of several atmospheric species (water vapor, ozone, nitrous oxide, methane, and dichlorodifluoromethane) has been demonstrated within four precisely selected molecule-specific narrow spectral windows ( 1 cm 1 ). Atmospheric transmission lines within each selected window were fully resolved through mode-hop-free continuous tuning of the LO frequency. Comparison measurements were made simultaneously with a high-resolution Fourier transform spectrometer to demonstrate the advantages of the laser heterodyne system for atmospheric sounding at high spectral and spatial resolutions.

© 2011 Optical Society of America

OCIS Codes
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(280.4991) Remote sensing and sensors : Passive remote sensing
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:
Spectroscopy

History
Original Manuscript: March 1, 2011
Revised Manuscript: April 22, 2011
Manuscript Accepted: April 24, 2011
Published: May 20, 2011

Citation
Damien Weidmann, Tracy Tsai, Neil A. Macleod, and Gerard Wysocki, "Atmospheric observations of multiple molecular species using ultra-high-resolution external cavity quantum cascade laser heterodyne radiometry," Opt. Lett. 36, 1951-1953 (2011)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-36-11-1951


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References

  1. R. T. Menzies, in Laser Monitoring of the Atmosphere, E.D.Hinkley, ed. (Springer, 1976), Chap. 7.
  2. W. Bell, N. A. Martin, T. D. Gardiner, N. R. Swann, P. T. Woods, P. F. Fogal, and J. W. Waters, Geophys. Res. Lett. 21, 1347 (1994). [CrossRef]
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