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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 28 — Dec. 31, 2012
  • pp: 29727–29742

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

Brian Brumfield and Gerard Wysocki  »View Author Affiliations

Optics Express, Vol. 20, Issue 28, pp. 29727-29742 (2012)

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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.

© 2012 OSA

OCIS Codes
(280.3420) Remote sensing and sensors : Laser sensors
(300.6360) Spectroscopy : Spectroscopy, laser
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: October 24, 2012
Revised Manuscript: December 7, 2012
Manuscript Accepted: December 12, 2012
Published: December 20, 2012

Brian Brumfield and Gerard Wysocki, "Faraday rotation spectroscopy based on permanent magnets for sensitive detection of oxygen at atmospheric conditions," Opt. Express 20, 29727-29742 (2012)

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