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Faraday rotation spectroscopy based on permanent magnets for sensitive detection of oxygen at atmospheric conditions

Author(s): Brumfield, Brian; Wysocki, Gerard

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Abstract: A low-power Faraday rotation spectroscopy system that uses permanent rare-earth magnets has been developed for detection of O2 at 762 nm. The experimental signals are generated using laser wavelength modulation combined with a balanced detection scheme that permits quantum shot noise limited performance. A noise equivalent polarization rotation angle of 8 × 108 rad/Hz1/2 is estimated from the experimental noise, and this agrees well with a theoretical model based on Jones calculus. A bandwidth normalized minimum detection limit to oxygen of 6 ppmv/Hz 1/2 with an ultimate minimum of 1.3 ppmv at integration times of ∼1 minute has been demonstrated.
Publication Date: 31-Dec-2012
Electronic Publication Date: 20-Dec-2012
Citation: Brumfield, Brian, Wysocki, Gerard. (2012). Faraday rotation spectroscopy based on permanent magnets for sensitive detection of oxygen at atmospheric conditions. Optics Express, 20 (28), 29727 - 29727. doi:10.1364/OE.20.029727
DOI: doi:10.1364/OE.20.029727
EISSN: 1094-4087
Pages: 29727 - 29727
Type of Material: Journal Article
Journal/Proceeding Title: Optics Express
Version: Author's manuscript



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