Detuned square-wave optical modulation zero-field  atomic magnetometer

Xiaoyu Li; Bangcheng Han; Jixi Lu; Ziao Liu; Yifan Yan

doi:10.1117/12.3015902

29 December 2023 Detuned square-wave optical modulation zero-field atomic magnetometer

Xiaoyu Li, Bangcheng Han, Jixi Lu, Ziao Liu, Yifan Yan

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 129750Y (2023) https://doi.org/10.1117/12.3015902
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

In recent years, arrayed atomic magnetometers have been continuously applied in biomagnetic scenarios. However, the crosstalk between adjacent sensors introduced by the modulated magnetic fields significantly compromises the imaging accuracy of arrayed atomic magnetometers. To solve this problem, a detuned square-wave optical modulation zero-field atomic magnetometer configuration is developed and we provide an analytical solution of this method. In this scheme, the circularly polarized pump light is used to polarize alkali metal atoms longitudinally, and a beam of detuned square-wave modulated circularly polarized light is applied transversely to generate a light-shift modulation instead of the coil-generated modulated magnetic field. Then the transverse magnetic field is measured by the optical absorption method of longitudinally circularly polarized pump light. This scheme maintains the inherent advantage of high sensitivity in spinexchange relaxation-free (SERF) atomic magnetometers. Additionally, the all-optical configuration eliminates the need for additional modulated magnetic fields or radio frequency (RF) fields, thereby mitigating crosstalk issues associated with modulated magnetic fields in array applications. Consequently, this scheme exhibits great potential for arraying and is expected to be employed in magnetocardiography (MCG) and magnetoencephalography (MEG).

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Xiaoyu Li, Bangcheng Han, Jixi Lu, Ziao Liu, and Yifan Yan "Detuned square-wave optical modulation zero-field atomic magnetometer", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 129750Y (29 December 2023); https://doi.org/10.1117/12.3015902

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KEYWORDS

Modulation

Magnetism

Quantum magnetometry

Polarized light

Alkali metals

Magnetometers

Rubidium

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