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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.|
|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|
|Pages:||29727 - 29727|
|Type of Material:||Journal Article|
|Journal/Proceeding Title:||Optics Express|
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