Miniaturized atomic magnetometer employing pump-beam modulation

Ziqian Yue; Junjian Tang; Yueyang Zhai

doi:10.1117/12.3035399

20 November 2024 Miniaturized atomic magnetometer employing pump-beam modulation

Ziqian Yue, Junjian Tang, Yueyang Zhai

Proceedings Volume 13243, Advanced Sensor Systems and Applications XIV; 132430R (2024) https://doi.org/10.1117/12.3035399
Event: SPIE/COS Photonics Asia, 2024, Nantong, Jiangsu, China

Conference Poster

Abstract

Atomic magnetometers with magnetic field modulation have emerged as pivotal sensors for biomagnetic measurements. However, challenges such as crosstalk between adjacent modulation fields and the complexity of signal circuitry become increasingly serious in the development of array-based equipment with the magnetometers, especially in the miniaturized atomic magnetometer. This paper proposes an all-optical, fully integrated fiber-coupled atomic magnetometer that employs pump beam modulation. A miniaturized atomic magnetometer with a volume of 10 cm³ has been designed, incorporating an active measurement area of 3 × 3 × 3 mm³. The magnetometer operates in the spinexchange relaxation-free (SERF) regime with an ⁸⁷Rb vapor cell. An amplitude-modulated pump beam directly modulates the rubidium atomic ensembles, rather than the magnetic field modulation. The optical rotation angle is detected by an unmodulated probe beam oriented orthogonally to the pump beam. In light of the discontinuous pumping characteristics, we developed a modified theoretical model to clarify the output response of the proposed atomic magnetometer. The experimental results demonstrate that the new design achieves the same sensitivity as conventional magnetometer configurations with a smaller volume and without crosstalk of the magnetic field. This research highlights the significant potential for advancing the development of highly sensitive, miniaturized atomic magnetometers, making them particularly suitable for applications in magnetocardiography (MCG) and magnetoencephalography (MEG).

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

Citation Download Citation

Ziqian Yue, Junjian Tang, and Yueyang Zhai "Miniaturized atomic magnetometer employing pump-beam modulation", Proc. SPIE 13243, Advanced Sensor Systems and Applications XIV, 132430R (20 November 2024); https://doi.org/10.1117/12.3035399

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