Spin noise spectroscopy of an alignment-based atomic magnetometer

Author:

Koźbiał M.1ORCID,Elson L.2ORCID,Rushton L. M.2ORCID,Akbar A.2ORCID,Meraki A.2,Jensen K.2ORCID,Kołodyński J.1ORCID

Affiliation:

1. University of Warsaw

2. University of Nottingham

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

Funder

Engineering and Physical Sciences Research Council

Narodowe Centrum Nauki

Horizon 2020

Novo Nordisk Fonden

Publisher

American Physical Society (APS)

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