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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 1 — Jan. 2, 2012
  • pp: 644–653

Signal-to-noise ratio in chirped laser dispersion spectroscopy

Michal Nikodem, Damien Weidmann, Clinton Smith, and Gerard Wysocki  »View Author Affiliations

Optics Express, Vol. 20, Issue 1, pp. 644-653 (2012)

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Quantitative studies and experimental validation of noise sources occurring in chirped laser dispersion spectroscopy (CLaDS) are reported. Their impact on the signal-to-noise ratio (SNR) achievable with the CLaDS sensing method is analyzed through a noise model supported by experimental results. In particular the model shows that the SNR is optimal for a given value of the laser chirp rate. The experimental studies are conducted with a quantum cascade laser operating at 5.2 µm for the detection of nitric oxide. Optical fringing has been found to be a significant non-random source of noise and an effective reduction method that can improve the SNR is also discussed.

© 2011 OSA

OCIS Codes
(300.6310) Spectroscopy : Spectroscopy, heterodyne
(300.6390) Spectroscopy : Spectroscopy, molecular
(140.5965) Lasers and laser optics : Semiconductor lasers, quantum cascade

ToC Category:

Original Manuscript: November 9, 2011
Manuscript Accepted: December 10, 2011
Published: December 23, 2011

Michal Nikodem, Damien Weidmann, Clinton Smith, and Gerard Wysocki, "Signal-to-noise ratio in chirped laser dispersion spectroscopy," Opt. Express 20, 644-653 (2012)

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