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Open AccessArticle

A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts

1
State Key Laboratory of Advanced Optical Communication Systems and Networks, Department of Electronics, and Center for Quantum Information Technology, Peking University, Beijing 100871, China
2
School of Information Science and Technology, Tsinghua University, Beijing 100084, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2020, 10(10), 3608; https://doi.org/10.3390/app10103608
Received: 29 March 2020 / Revised: 15 May 2020 / Accepted: 19 May 2020 / Published: 22 May 2020
(This article belongs to the Section Applied Physics)
We propose a compact 4He magnetometer realizing magnetic field measurement and laser-frequency stabilization simultaneously in a single 4He atomic cell. The frequency stabilization scheme is based on the asymmetric line shape of magnetic resonance which is induced by spatially inhomogeneous light shifts. We investigate the asymmetric line shape of the magnetic resonance signal theoretically and experimentally in laser pumped 4He magnetometer with the magneto-optical double-resonance configuration. Notice that, due to the asymmetric line shape, the in-phase component of the magnetic resonance signal is shown to have a linear dependence with respect to the laser frequency detuning and is used to actively lock the laser frequency to the resonant point. The method reduces the complexity of the system and improves the stability of the magnetometer, making the laser-pumped 4He magnetometer more compact and portable. View Full-Text
Keywords: laser pumped 4He magnetometer; frequency stabilization; inhomogeneous light shifts laser pumped 4He magnetometer; frequency stabilization; inhomogeneous light shifts
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MDPI and ACS Style

Wang, H.; Wu, T.; Wang, H.; Li, S.; Lin, Z.; Peng, X.; Guo, H. A Compact Laser Pumped 4He Magnetometer with Laser-Frequency Stabilization by Inhomogeneous Light Shifts. Appl. Sci. 2020, 10, 3608.

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