Hybrid Faraday rotation spectrometer for subppm detection of atmospheric O2

Eric J. Zhang, Brian Brumfield, Gerard Wysocki

Research output: Contribution to journalArticlepeer-review

32 Scopus citations


Faraday rotation spectroscopy (FRS) of O2 is performed at atmospheric conditions using a DFB diode laser and permanent rare-earth magnets. Polarization rotation is detected with a hybrid-FRS detection method that combines the advantages of two conventional approaches: balanced optical-detection and conventional FRS with an optimized analyzer offset angle for maximum sensitivity enhancement. A measurement precision of 0.6 ppmv·Hz-1/2 for atmospheric O2 has been achieved. The theoretical model of hybrid detection is described, and the calculated detection limits are in excellent agreement with experimental values.

Original languageEnglish (US)
Pages (from-to)15957-15968
Number of pages12
JournalOptics Express
Issue number13
StatePublished - Jun 30 2014

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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