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Better magneto-optical filters with cascaded vapor cells

Logue, Fraser D.; Briscoe, Jack D.; Pizzey, Danielle; Wrathmall, Steven A.; Hughes, Ifan G.

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Fraser Logue
PGR Student Doctor of Philosophy

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Jack Briscoe
PGR Student Doctor of Philosophy


Single-cell magneto-optical Faraday filters find great utility and are realized with either ‘wing’ or ‘line center’ spectral profiles. We show that cascading a second cell with independent axial (Faraday) or transverse (Voigt) magnetic field leads to improved performance in terms of figure of merit (FOM) and spectral profile. The first cell optically rotates the plane of polarization of light creating the high transmission window; the second cell selectively absorbs the light eliminating unwanted transmission. Using naturally-abundant Rb vapor cells, we realize a Faraday-Faraday wing filter and the first recorded Faraday-Voigt line center filter which show excellent agreement with theory. The two filters have FOM values of 0.86 and 1.63 GHz−1 respectively.

Journal Article Type Article
Acceptance Date May 10, 2022
Online Publication Date Jun 3, 2022
Publication Date 2022
Deposit Date May 13, 2022
Publicly Available Date Jun 3, 2023
Journal Optics Letters
Print ISSN 0146-9592
Electronic ISSN 1539-4794
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 47
Issue 12
Pages 2975-2978
Public URL


Accepted Journal Article (7.1 Mb)

Copyright Statement
Published by Optica Publishing Group under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this
work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

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