Three-axis closed-loop optically pumped magnetometer operated in the SERF regime

作者：Yeguang Yan, Jixi Lu, Shaowen Zhang, Fei Lu, Kaifeng Yin, Kun Wang, Binquan Zhou, Gang Liu · 发表于：Optics Express · 年份：2022 · DOI：10.1364/oe.458367 · 被引用次数：83 · 研究领域：Atomic and Subatomic Physics Research、Quantum optics and atomic interactions、Advanced MRI Techniques and Applications

We propose a three-axis closed-loop optically pumped magnetometer with high sensitivity. The closed-loop magnetometer has a three-axis sensitivity of approximately 30 fT/Hz 1/2 using two orthogonal laser beams for pumping and probing the alkali metal atoms. In the closed-loop mode, the dynamic range is improved from ±5 nT to ±150 nT. The bandwidth is increased from about 100 Hz to over 2 kHz with 10 kHz modulation fields in x - and y -axes and another 6 kHz modulation field along the z -axis. Compared with single-axis or dual-axis magnetometers, the proposed magnetometer not only provides the direction and magnitude of the magnetic field but also has high robustness in a challenging environment. The magnetometer has applications in biomagnetic measurements, magnetic resonance imaging, and fundamental physics.