Four-channel optically pumped magnetometer for a magnetoencephalography sensor array

Iivanainen, Joonas; Carter, Tony R.; Dhombridge, Jonathan E.; Read, Timothy S.; Campbell, Kaleb; Abate, Quinn; Ridley, David M.; Borna, Amir; Schwindt, Peter D. D.

doi:10.1364/OE.517961

Title: Four-channel optically pumped magnetometer for a magnetoencephalography sensor array

Journal Article · 03 May 2024 · Optics Express

DOI: https://doi.org/10.1364/OE.517961 · OSTI ID:2345817

; Carter, Tony R.; Dhombridge, Jonathan E.; Read, Timothy S.; Campbell, Kaleb; Abate, Quinn; Ridley, David M.; Borna, Amir;

We present a novel four-channel optically pumped magnetometer (OPM) for magnetoencephalography that utilizes a two-color pump/probe scheme on a single optical axis. We characterize its performance across 18 built sensor modules. The new sensor implements several improvements over our previously developed sensor including lower vapor-cell operating temperature, improved probe-light detection optics, and reduced optical power requirements. The sensor also has new electromagnetic field coils on the sensor head which are designed using stream-function-based current optimization. We detail the coil design methodology and present experimental characterization of the coil performance. The magnetic sensitivity of the sensor is on average 12.3 fT/rt-Hz across the 18 modules while the average gradiometrically inferred sensitivity is about 6.0 fT/rt-Hz. The sensor 3-dB bandwidth is 100 Hz on average. The on-sensor coil performance is in good agreement with the simulations.

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Sponsoring Organization:: USDOE

OSTI ID:: 2345817

Journal Information:: Optics Express, Journal Name: Optics Express Vol. 32 Journal Issue: 10; ISSN 1094-4087

Publisher:: Optical Society of AmericaCopyright Statement

Country of Publication:: United States

Language:: English

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