Description
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].
References
[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 |
|---|---|
| How will you attend ICAP-27? | I am planning on in-person attendance |
