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The hyperfine Paschen-Back Faraday effect.

Zentile, Mark A. and Andrews, Rebecca and Weller, Lee and Knappe, Svenja and Adams, Charles S. and Hughes, Ifan G. (2014) 'The hyperfine Paschen-Back Faraday effect.', Journal of physics B : atomic, molecular and optical physics., 47 (7). 075005.


We investigate experimentally and theoretically the Faraday effect in an atomic medium in the hyperfine Paschen–Back regime, where the Zeeman interaction is larger than the hyperfine splitting. We use a small permanent magnet and a micro-fabricated vapour cell, giving magnetic fields of the order of a tesla. We show that for low absorption and small rotation angles, the refractive index is well approximated by the Faraday rotation signal, giving a simple way to measure the atomic refractive index. Fitting to the atomic spectra, we achieve magnetic field sensitivity at the 10−4 level. Finally we note that the Faraday signal shows zero crossings which can be used as temperature insensitive error signals for laser frequency stabilization at large detuning. The theoretical sensitivity for 87Rb is found to be ~40 kHz °C−1.

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Publisher statement:Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Date accepted:No date available
Date deposited:10 April 2014
Date of first online publication:March 2014
Date first made open access:No date available

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