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Optics Letters

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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