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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 1 — Jan. 5, 2009
  • pp: 248–259

High-resolution broadband (>100 cm-1) infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser

Damien Weidmann and Gerard Wysocki  »View Author Affiliations

Optics Express, Vol. 17, Issue 1, pp. 248-259 (2009)

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Broadband thermal infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser as a tunable local oscillator has been performed over a frequency range of more than 100 cm-1 at a central frequency of 1190 cm-1. Heterodyne spectro-radiometry is demonstrated for two local oscillator tuning modes: broadband tuning for transmission and emission spectroscopy of broadband absorbers (Freon 12), and broadband frequency selection in combination with fine continuous frequency tuning for high-resolution (0.021 cm-1) transmission spectroscopy (N2O). In each case concentration retrievals are performed and analyzed. The spectro-radiometer noise level is demonstrated to be twenty two and eight times the fundamental shot-noise limit in the two scanning modes respectively.

© 2009 Optical Society of America

OCIS Codes
(140.3600) Lasers and laser optics : Lasers, tunable
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6390) Spectroscopy : Spectroscopy, molecular
(280.4991) Remote sensing and sensors : Passive remote sensing

ToC Category:

Original Manuscript: November 17, 2008
Revised Manuscript: December 20, 2008
Manuscript Accepted: December 22, 2008
Published: December 24, 2008

Damien Weidmann and Gerard Wysocki, "High-resolution broadband (>100 cm-1) infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser," Opt. Express 17, 248-259 (2009)

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