Spin noise spectroscopy of an alignment-based atomic magnetometer

Koźbiał, M.; Elson, L.; Rushton, L. M.; Akbar, A.; Meraki, A.; Jensen, K.; Kołodyński, J.

Abstract

Optically pumped magnetometers (OPMs) are revolutionizing the task of magnetic-field sensing due to their extremely high sensitivity combined with technological improvements in miniaturization which have led to compact and portable devices. OPMs can be based on spin-oriented or spin-aligned atomic ensembles which are spin polarized through optical pumping with circular or linear polarized light, respectively. Characterization of OPMs and the dynamical properties of their noise is important for applications in real-time sensing tasks. In our work, we experimentally perform spin noise spectroscopy of an alignment-based magnetometer. Moreover, we propose a stochastic model that predicts the noise power spectra exhibited by the device when, apart from the strong magnetic field responsible for the Larmor precession of the spin, white noise is applied in the perpendicular direction aligned with the pumping-probing beam. By varying the strength of the noise applied as well as the linear-polarization angle of incoming light, we verify the model to accurately predict the heights of the Larmor-induced spectral peaks and their corresponding linewidths. Our work paves the way for alignment-based magnetometers to become operational in real-time sensing tasks. Published by the American Physical Society 2024

Citation

Koźbiał, M., Elson, L., Rushton, L. M., Akbar, A., Meraki, A., Jensen, K., & Kołodyński, J. (2024). Spin noise spectroscopy of an alignment-based atomic magnetometer. Physical Review A, 110(1), Article 013125. https://doi.org/10.1103/physreva.110.013125

• Journal Article Type: Article
• Acceptance Date: Jun 7, 2024
• Online Publication Date: Jul 30, 2024
• Publication Date: Jul 30, 2024
• Deposit Date: Sep 20, 2024
• Publicly Available Date: Sep 23, 2024
• Journal: Physical Review A
• Print ISSN: 2469-9926
• Electronic ISSN: 2469-9934
• Publisher: American Physical Society
• Peer Reviewed: Peer Reviewed
• Volume: 110
• Issue: 1
• Article Number: 013125
• DOI: https://doi.org/10.1103/physreva.110.013125
• Public URL: https://nottingham-repository.worktribe.com/output/38365752
• Publisher URL: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.110.013125