Single-beam double-pass miniaturized atomic magnetometer for bio-magnetic imaging systems

Miniaturized atomic magnetometers, particularly spin-exchange relaxation-free atomic magnetometers, have been emerging in clinical imaging applications such magnetocardiography and magnetoencephalography. Miniaturization, portability, and low cost are primary development targets for bio-magnetic ima...

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Bibliographic Details
Published inarXiv.org
Main Authors Li, Xiaojie, Guo, Zhihao, Yang, Rui, Feng, Yanying
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 27.04.2022
Subjects
Building components
Configurations
Imaging
Low cost
Magnetic resonance
Magnetocardiography
Magnetoencephalography
Magnetometers
Miniaturization
Optical fibers
Resonance lines
Sensitivity
Sensor arrays
Temperature effects
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Summary:Miniaturized atomic magnetometers, particularly spin-exchange relaxation-free atomic magnetometers, have been emerging in clinical imaging applications such magnetocardiography and magnetoencephalography. Miniaturization, portability, and low cost are primary development targets for bio-magnetic imaging technologies, as well as high sensitivity and spatial and time resolution. In this paper, we propose a low-cost solution for a bio-magnetic imaging system based on atomic magnetometers, in which one laser source is used for a multi-channel atomic magnetometer sensor array. A novel design is demonstrated for a miniaturized spin-exchange relaxation-free atomic magnetometer, consisting of a single-beam double-pass configuration based on an optical fiber circulator. The effects of temperature and laser power on the zero-field magnetic resonance line-width are characterized, and the experimental results show that the present design achieves better performance, than a traditional single-beam single-pass configuration. The noise power spectrum shows that the closed-loop miniaturized atomic magnetometer reaches a sensitivity of approximately 120 fT/Hz\(^{1/2}\) at a bandwidth of 10 Hz. This design is especially suitable for atomic magnetometers operating in arrays as a basic building element for low-cost bio-magnetic imaging systems.
ISSN:2331-8422