The hyperfine Paschen-Back Faraday effect

Zentile, Mark A.; Andrews, Rebecca; Weller, Lee; Knappe, Svenja; Adams, Charles S.; Hughes, Ifan G.

doi:10.1088/0953-4075/47/7/075005

The hyperfine Paschen-Back Faraday effect

Zentile, Mark A.; Andrews, Rebecca; Weller, Lee; Knappe, Svenja; Adams, Charles S.; Hughes, Ifan G.

Authors

Mark A. Zentile

Rebecca Andrews

Lee Weller

Svenja Knappe

Charles S. Adams

Professor Ifan Hughes i.g.hughes@durham.ac.uk
Professor

Abstract

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.

Citation

Zentile, M. A., Andrews, R., Weller, L., Knappe, S., Adams, C. S., & Hughes, I. G. (2014). The hyperfine Paschen-Back Faraday effect. Journal of Physics B: Atomic, Molecular and Optical Physics, 47(7), Article 075005. https://doi.org/10.1088/0953-4075/47/7/075005

Journal Article Type	Article
Publication Date	Mar 26, 2014
Deposit Date	Dec 2, 2013
Publicly Available Date	Apr 10, 2014
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Print ISSN	0953-4075
Electronic ISSN	1361-6455
Publisher	IOP Publishing
Peer Reviewed	Peer Reviewed
Volume	47
Issue	7
Article Number	075005
DOI	https://doi.org/10.1088/0953-4075/47/7/075005

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