Mr. Jixi Lu Profile

Jixi Lu

at Beihang Univ

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Proceedings Article | 29 December 2023 Paper

Detuned square-wave optical modulation zero-field atomic magnetometer

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

Proceedings Volume 12975, 129750Y (2023) https://doi.org/10.1117/12.3015902

KEYWORDS: Modulation, Magnetism, Quantum magnetometry, Polarized light, Magnetometers, Alkali metals, Rubidium

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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).

Proceedings Article | 27 December 2022 Poster + Paper

Development of non-magnetic VCSEL module for compact atomic magnetometer

Quanpu Liu, Zhen Chai, Jixi Lu, Kaifeng Yin, Jianli Li

Proceedings Volume 12311, 123110U (2022) https://doi.org/10.1117/12.2643617

KEYWORDS: Magnetometers, Vertical cavity surface emitting lasers, Magnetism, Wave plates, Collimation, Polarization, Packaging, Optics manufacturing, Optical components

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The integrated Vertical-Cavity Surface-Emitting Lasers (VCSELs) modules have been widely researched and manufactured accompanying with the rapid development of compact atomic magnetometers, atomic gyroscopes, atomic clocks, and the other atomic sensors. For atomic magnetometers operating in the Spin-Exchange Relaxation-Free (SERF) regime, the vapor cell should be heated to a high temperature, which may cause the built-in laser chip over-heated and module structural or optical component deformation, lowering the performance of the built-in laser module. Meanwhile, due to the space constraints, the laser module needs to achieve a large collimation beam diameter and the non-magnetic structure should be optimized to have high temperature tolerance and stable thermal dissipation. In this study, a compact non-magnetic VCSEL module is developed based on the non-magnetic structure with the abilities of optical path alignment, beam collimation, and polarization conversion. Compared with the common TO-can packaging, the proposed VCSEL module achieved low residual magnetic field generated. And the entire volume is less than 1 cm3 with the collimating beam diameter of 2 mm. The experiment evaluation result shows that the laser module could work stably in high temperature with stable thermal dissipation and sufficient thermal margin (60±10℃) for precise wavelength tuning and maintain optical performance and structural for meeting the demand of pump laser in the SERF atomic magnetometers.

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