Abstract

We present real-time optical polarization subtraction for calibration of Faraday rotation spectra. Noise analysis yields minor isotope sensitivity of 3.0 ppbv·Hz−1/2 and 1.7×10−8 rad·Hz−1/2 noise-equivalent angle. Sub-permil ratiometric precision is achieved at integration times >100 s.

© 2016 Optical Society of America

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