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

Brian E. Brumfield | Zendy; Gerard Wysocki | Zendy

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

Author(s) -

Brian E. Brumfield,

Gerard Wysocki

Publication year - 2012

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.20.029727

Subject(s) - faraday effect , optics , physics , spectroscopy , magnet , polarization (electrochemistry) , wavelength , rotation (mathematics) , faraday rotator , laser , faraday cage , noise (video) , materials science , magnetic field , chemistry , quantum mechanics , artificial intelligence , computer science , geometry , mathematics , image (mathematics)

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 × 10⁻⁸ 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/Hz¹/² with an ultimate minimum of 1.3 ppmv at integration times of ~1 minute has been demonstrated.

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