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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 2 — Jan. 10, 2009
  • pp: 408–413

Absorption and wavelength modulation spectroscopy of NO 2 using a tunable, external cavity continuous wave quantum cascade laser

Andreas Karpf and Gottipaty N. Rao  »View Author Affiliations

Applied Optics, Vol. 48, Issue 2, pp. 408-413 (2009)

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The absorption spectra and wavelength modulation spectroscopy (WMS) of NO 2 using a tunable, external cavity CW quantum cascade laser operating at room temperature in the region of 1625 to 1645 cm 1 are reported. The external cavity quantum cascade laser enabled us to record continuous absorption spectra of low concentrations of NO 2 over a broad range ( 16 cm 1 ), demonstrating the potential for simultaneously recording the complex spectra of multiple species. This capability allows the identification of a particular species of interest with high sensitivity and selectivity. The measured spectra are in excellent agreement with the spectra from the high-resolution transmission molecular absorption database [ J. Quant. Spectrosc. Radiat. Transfer 96, 139–204 (2005)]. We also conduct WMS for the first time using an external cavity quantum cascade laser, a technique that enhances the sensitivity of detection. By employing WMS, we could detect low-intensity absorption lines, which are not visible in the simple absorption spectra, and demonstrate a minimum detection limit at the 100 ppb level with a short-path absorption cell. Details of the tunable, external cavity quantum cascade laser system and its performance are discussed.

© 2009 Optical Society of America

OCIS Codes
(000.2170) General : Equipment and techniques
(010.1120) Atmospheric and oceanic optics : Air pollution monitoring
(120.6200) Instrumentation, measurement, and metrology : Spectrometers and spectroscopic instrumentation
(280.3420) Remote sensing and sensors : Laser sensors
(300.1030) Spectroscopy : Absorption
(300.6340) Spectroscopy : Spectroscopy, infrared

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: September 16, 2008
Revised Manuscript: December 5, 2008
Manuscript Accepted: December 9, 2008
Published: January 9, 2009

Andreas Karpf and Gottipaty N. Rao, "Absorption and wavelength modulation spectroscopy of NO2 using a tunable, external cavity continuous wave quantum cascade laser," Appl. Opt. 48, 408-413 (2009)

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