Jul 17 – 22, 2022
Royal Conservatory of Music, Toronto
America/Toronto timezone

Two-beam self-oscillating OPM for low-drift high-precision DC magnetometry

Jul 21, 2022, 5:00 PM
1h 30m
Hart House (Hart House)

Hart House

Hart House

7 Hart House Cir, Toronto, ON M5S 3H3
Poster presentation Precision measurement and tests of fundamental physics Poster session


Finite-field optical magnetometry offers practical advantages in geophysics, surveying and navigation due to the sensitivity and accuracy achievable with alkali double-resonance techniques. In this sensor scheme, resonant modulation at the Larmor frequency is applied to the alkali spins in order to drive the resonant response and maximise signal contrast [1,2]. Homodyne detection also offers a path to noise reduction in scalable electronic systems. In order to develop operating modes and readout schemes we have built a shielded laboratory magnetometer system using anti-relaxation-coated 133Cs cells [3]. We will run this system as a self-oscillating spin maser as a platform for development of low-drift high-precision DC magnetometry, including study of spin dynamics and limiting noise sources.

We present developments of a two-beam optically pumped alkali magnetometer for investigation of stable Cramer-Rao-lower-bound limited magnetometry, spin-noise limited off-resonant detection of spin maser precession and long-timescale shielded optical magnetometry. We discuss potential future development of this system as a network node for new physics searches [4].


[1] I. M. Savukov et al., Phys. Rev, Lett. 95, 063004 (2005)
[2] S. Groeger et al., Eur. Phys. J. D 38, 239-247 (2006)
[3] N. Castagna et al., Appl. Phys. B 96, 763-772 (2009)
[4] S. Afach et al., Phys. Of the Dark Univ. 22, 162-180 (2018)

Presenter name Aurélien Chopinaud
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Primary authors

Aurelien Chopinaud (University of Strathclyde) Dr Stuart Ingleby (University of Strathclyde)


Mr Marcin Mrozowski (University of Strathclyde) Dr Carolyn O'Dwyer (University of Strathclyde) Dr Paul F. Griffin (University of Strathclyde) Prof. Erling Riis (University of Strathclyde)

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