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Signal-to-noise ratio in chirped laser dispersion spectroscopy

Author(s): Nikodem, Michal; Weidmann, Damien; Smith, Clinton; Wysocki, Gerard

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Abstract: 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.
Publication Date: 2-Jan-2012
Electronic Publication Date: 23-Dec-2011
Citation: Nikodem, Michal, Weidmann, Damien, Smith, Clinton, Wysocki, Gerard. (2012). Signal-to-noise ratio in chirped laser dispersion spectroscopy. Optics Express, 20 (1), 644 - 644. doi:10.1364/OE.20.000644
DOI: doi:10.1364/OE.20.000644
EISSN: 1094-4087
Pages: 644 - 644
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Final published version. This is an open access article.

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