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

Brian Brumfield, Gerard Wysocki

Research output: Contribution to journalArticle

32 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)29727-29742
Number of pages16
JournalOptics Express
Volume20
Issue number28
DOIs
StatePublished - Dec 31 2012

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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