In-situ measurement of the electron spin polarization by controlling its distribution in atomic ensembles

Article Engineering, Multidisciplinary

Accurate determination of alkali atom density based on zero-field magnetic resonance in a single-beam spin-exchange relaxation-free atomic magnetometer

Yintao Ma et al.

Summary: This study presents a novel scheme based on zero-field magnetic resonance to determine atomic density. Experimental results show that atomic density can be accurately extracted under different transverse DC magnetic fields, which is of great significance for the development of chip-scale atomic magnetometers.

MEASUREMENT SCIENCE AND TECHNOLOGY (2022)

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Article Optics

Single beam Cs-Ne SERF atomic magnetometer with the laser power differential method

Yao Chen et al.

Summary: In this paper, we introduce a single beam compact spin exchange relaxation free (SERF) magnetometer that is simple in configuration and compatible with the silicon-glass bonding micro-machining method. We experimentally and theoretically demonstrate that Ne buffer gas is more efficient in reducing wall relaxation compared to other commonly used gas species. We also propose a laser power differential method to suppress power noise and achieve significant improvement. Furthermore, we study a Cs-based atomic magnetometer to reduce power consumption and achieve high sensitivity.

OPTICS EXPRESS (2022)

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Article Physics, Multidisciplinary

Experimental Limits on Exotic Spin and Velocity Dependent Interactions Using Rotationally Modulated Source Masses and an Atomic-Magnetometer Array

K. Y. Wu et al.

Summary: This article reports new experimental upper limits on exotic spin-velocity-dependent interactions between electrons and nucleons. The researchers utilized a rotation method to eliminate possible slow drifting and found significant improvements in constraints for the vector-axial-vector interaction and the axial-axial interaction.

PHYSICAL REVIEW LETTERS (2022)

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Article Physics, Applied

Single-beam integrated hybrid optical pumping spin exchange relaxation free magnetometer for biomedical applications

Yintao Ma et al.

Summary: This study presents an ingenious approach to achieve high signal enhancement and relatively homogeneous spin polarization using optical pumping in a hybrid atomic magnetometer. Experimental results demonstrate the effectiveness of this method and suggest potential applications in highly sensitive and chip-scale magnetic field detection.

APPLIED PHYSICS LETTERS (2022)

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Article Biochemical Research Methods

Spin exchange optically pumped nuclear spin self compensation system for moving magnetoencephalography measurement

Yao Chen et al.

Summary: In this study, we developed a method using an optically pumped atomic co-magnetometer (OPACM) for recording moving magnetoencephalograms (MEGs). The magnetic field compensation was studied theoretically and experimentally, showing that the OPACM effectively suppresses low-frequency magnetic fields but has weaker responses to magnetic field frequencies around the MEG band.

BIOMEDICAL OPTICS EXPRESS (2022)

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Article Multidisciplinary Sciences

A quantum enhanced search for dark matter axions

K. M. Backes et al.

Summary: The study uses vacuum squeezing technology to overcome the quantum noise limit and did not find evidence of dark matter axions within a specific mass range, demonstrating the potential of noise reduction techniques in fundamental physics searches.

NATURE (2021)

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Article Optics

High-sensitivity operation of a single-beam atomic magnetometer for three-axis magnetic field measurement

Junjian Tang et al.

Summary: An atomic magnetometer capable of measuring a three-axis magnetic field with high sensitivity has been developed using elliptically polarized light. By optimizing key parameters, the magnetometer achieves sensitivity levels of 20 fT/Hz(1/2) in the x-axis, 25 fT/Hz(1/2) in the y-axis, and 30 fT/Hz(1/2) in the z-axis, making it suitable for non-invasive bio-magnetic imaging applications.

OPTICS EXPRESS (2021)

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Article Engineering, Electrical & Electronic