Three-axis magnetic field detection with a compact, high-bandwidth, single beam zero-field atomic magnetometer

Rach Dawson; Carolyn O'Dwyer; Marcin S. Mrozowski; Stuart Ingleby; Paul F. Griffin; Erling Riis

doi:10.1117/12.3002678

13 March 2024 Three-axis magnetic field detection with a compact, high-bandwidth, single beam zero-field atomic magnetometer

Rach Dawson, Carolyn O'Dwyer, Marcin S. Mrozowski, Stuart Ingleby, Paul F. Griffin, Erling Riis

Author Affiliations +

Proceedings Volume 12912, Quantum Sensing, Imaging, and Precision Metrology II; 1291210 (2024) https://doi.org/10.1117/12.3002678
Event: SPIE Quantum West, 2024, San Francisco, California, United States

Abstract

Zero-field optically pumped magnetometers (OPMs) have emerged as an important technology in the realm of biomagnetic research, providing extremely small magnetic field detection capabilities, femtotesla-level, contained in a non-cryogenic compact form factor. Often, compact zero-field OPMs extract single or two-axis magnetic information, typically with a sensing bandwidth of < 100 Hz. The resolution of multiple axes of magnetic field is particularly important for accurate representation of radial components of biomagnetic fields. However, the presence of multi-axis static magnetic fields across the OPM causes measurement errors that degrade signal resolution. Here, we utilise our compact caesium single beam zero-field OPM to address these limitations. We magnetically modulated along both transverse axes of the sensor, at unique frequencies, to extract all axes static-field information. Active feedback can be realised through a lock-in detection scheme at f_Mod,x/y for the x- and y-axes, and at 2f_Mod,x for the beam axis, z. Operation in this scheme allows for the extraction of three-axis magnetic field information from only a single beam and highlights the importance of active feedback in high-sensitivity biomagnetic applications. The portable sensor also demonstrates a bandwidth with a -3 dB point at ≃ 1600 Hz. The combination of high bandwidth and the capability to extract three-axis magnetic fields opens up exciting prospects for resolving high-frequency biomagnetic signals.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Rach Dawson, Carolyn O'Dwyer, Marcin S. Mrozowski, Stuart Ingleby, Paul F. Griffin, and Erling Riis "Three-axis magnetic field detection with a compact, high-bandwidth, single beam zero-field atomic magnetometer", Proc. SPIE 12912, Quantum Sensing, Imaging, and Precision Metrology II, 1291210 (13 March 2024); https://doi.org/10.1117/12.3002678

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