A new method to simultaneously improve the sensitivity and absolute accuracy for CPT magnetometer

This paper proposed a new method to simultaneously improve the sensitivity and absolute accuracy for coherent population trapping (CPT) magnetometer. CPT signals can be measured by scanning the frequency difference of a bichromatic pumping field around the ground-state hyperfine-splitting frequency...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2020-03, Vol.74 (3), Article 43
Main Authors: Fang, Wei, Jin, Shangzhong, Wu, Yufeng, Yan, Yongqiang, Li, Zenan, Zhang, Yiyi
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Atomic collisions
Feedback loops
Fluorescence
Molecular
Optical and Plasma Physics
Physical Chemistry
Physics
Physics and Astronomy
Quantum Information Technology
Quantum Physics
Regular Article
Sensitivity
Signal processing
Spectroscopy/Spectrometry
Spintronics
Splitting
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Summary:This paper proposed a new method to simultaneously improve the sensitivity and absolute accuracy for coherent population trapping (CPT) magnetometer. CPT signals can be measured by scanning the frequency difference of a bichromatic pumping field around the ground-state hyperfine-splitting frequency of 87 Rb. Meanwhile, the feedback loop can be used to adjust the pump radiation intensity to maintain a constant level of atomic vapour spontaneous fluorescence. This feedback loop improves the resonance contrast greatly. Then the Larmor frequency is determined by differential processing of CPT signals, which can reduce the effects of common-mode noise, nonlinear Zeeman splitting and atomic collisions. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2020-100374-5