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Faraday rotation spectrometer with sub-second response time for detection of nitric oxide using a cw DFB quantum cascade laser at 5.33 μm

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Abstract

A Faraday modulation spectrometer for sensitive and fast detection of nitric oxide at 5.33 μm utilizing a room temperature continuous wave distributed feedback quantum cascade laser and a Peltier cooled MCT detector is presented. The magnetic field was modulated at 7.4 kHz whereas the laser wavelength was scanned at 20 Hz across the most favorable rotational-vibrational transition for FAMOS, Q 3/2(3/2), at 5.33 μm. Using a 15 cm optical path and lineshape fitting, the spectrometer provides a detection limit of 4.5 ppb for a response time of 1 s. An Allan variance analysis demonstrates that the system has an excellent stability, up to several hours of operation.

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Authors and Affiliations

  1. IIA SLA R&D, Siemens AB, Box 14153, 400 20, Göteborg, Sweden

    P. Kluczynski & S. Lundqvist

  2. Department of Physics, Umeå University, 907 81, Umeå, Sweden

    J. Westberg & O. Axner

Authors
  1. P. Kluczynski
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  2. S. Lundqvist
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  3. J. Westberg
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  4. O. Axner
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Correspondence to P. Kluczynski.

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Kluczynski, P., Lundqvist, S., Westberg, J. et al. Faraday rotation spectrometer with sub-second response time for detection of nitric oxide using a cw DFB quantum cascade laser at 5.33 μm. Appl. Phys. B 103, 451–459 (2011). https://doi.org/10.1007/s00340-010-4336-8

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  • DOI: https://doi.org/10.1007/s00340-010-4336-8

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