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Chuanpeng Hao; Yu, QianQian; Yuan, Chunqi; Liu, Siqi; Dong Sheng
arXiv.org, 05/2021Paper, Journal Article
We present in this paper a Herriott-cavity-assisted closed-loop Xe isotope gas comagnetometer. In this system, \(^{129}\)Xe and \(^{131}\)Xe atoms are pumped and probed by polarized Rb atoms, and continuously driven by oscillating magnetic fields, whose frequencies are kept on resonance by phase-locked loops (PLLs). Different from other schemes, we use a Herriott cavity to improve the Rb magnetometer sensitivity instead of the parametric modulation method, and this passive method is aimed to improve the system stability while maintaining the sensitivity. This system has demonstrated an angle random walk (ARW) of 0.06 \(^\circ\)/h\(^{1/2}\), and a bias instability of 0.2 \(^\circ\)/h (0.15 \(\mu\)Hz) with a bandwidth of 1.5 Hz. By adding a closed-loop Rb isotope comagnetometer, we can extend this system to dual simultaneously working comagnetometers sharing the same cell. This extended system has wide applications in precision measurements, where we can simultaneously and independently measure the coupling of anomalous fields with proton spin and neutron spin.
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