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 . 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 .
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 S. Afach et al., Phys. Of the Dark Univ. 22, 162-180 (2018)
|Presenter name||Aurélien Chopinaud|
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