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Sub-ppb NO2 detection by optical feedback cavity-enhanced absorption spectroscopy with a blue diode laser

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Abstract

We report preliminary results on the first application of optical feedback cavity-enhanced absorption spectroscopy with a blue (411 nm) extended cavity diode laser (ECDL) for NO2 detection. While this technique was originally developed to operate with distributed feedback diode lasers in the near infrared, it is here extended to ECDLs and applied to the blue spectral region. With a simple and compact optical setup, we demonstrate from the baseline noise a minimum detectable NO2 concentration of 6×109 molecules/cm3 for a single laser scan (70 ms), which extrapolated under atmospheric conditions corresponds to 200 pptv. Signal averaging should allow further lowering of this limit. Observed absorption spectra display more structure than previous spectra obtained at lower resolution by Fourier-transform spectroscopy at the same wavelength.

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Authors and Affiliations

  1. Laboratoire de Spectrométrie Physique, CNRS UMR5588, Université J. Fourier de Grenoble, Saint Martin d’Hères, France

    I. Courtillot & D. Romanini

  2. Laboratoire de Spectrométrie Ionique et Moléculaire, CNRS UMR5579, Université Lyon I, Lyon, France

    J. Morville & V. Motto-Ros

Authors
  1. I. Courtillot
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  2. J. Morville
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  3. V. Motto-Ros
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  4. D. Romanini
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Correspondence to I. Courtillot.

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PACS

07.88.+y; 42.55.Px; 42.62.Fi

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Courtillot, I., Morville, J., Motto-Ros, V. et al. Sub-ppb NO2 detection by optical feedback cavity-enhanced absorption spectroscopy with a blue diode laser. Appl. Phys. B 85, 407–412 (2006). https://doi.org/10.1007/s00340-006-2354-3

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  • DOI: https://doi.org/10.1007/s00340-006-2354-3

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