A 85Rb transverse modulation magnetometer in the geophysical range based on atomic alignment states

IF 3.1 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Physics D: Applied Physics Pub Date : 2024-09-10 DOI:10.1088/1361-6463/ad726f
Tao Shi, Ge Jin, Hong Zhang and Sheng Zou
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Abstract

We have constructed a transverse modulated magnetometer based on spin alignment in a paraffin-coated 85 Rb cell operated in a geophysical magnetic field of 47.1 µT. When an orthogonal driving magnetic field ( axis) is resonant on the Larmor frequency ( axis), we have proposed a new method to zero the static residual magnetic fields in the transverse plane and achieved a sensitivity of with bandwidth of 200 Hz. The repump light ( ) redistributes the populations in the ground state, rendering the state dark. This effect significantly amplifies the optical rotation signals nearly fourfold. The numerical solution of the Liouville equation is in good agreement with the experimental results. By using perturbation treatment and employing appropriate approximations, the derived analytical expressions for optical rotation are deduced to succinctly elucidate the dynamics of atomic alignment under parametric modulation. These outcomes could be extended for the advancement of an alignment magnetometer that has been designed to detect a weak magnetic signal in the geophysical range.
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基于原子排列态的地球物理范围 85Rb 横向调制磁强计
我们构建了一个横向调制磁力计,它基于石蜡涂层 85 Rb 电池中的自旋排列,在 47.1 µT 的地球物理磁场中运行。当正交驱动磁场(轴)与拉莫尔频率(轴)共振时,我们提出了一种新方法,将横向平面上的静态残余磁场归零,并实现了带宽为 200 Hz 的灵敏度。回转光( )重新分配了基态中的种群,使基态变暗。这种效应将光学旋转信号放大了近四倍。刘维尔方程的数值解与实验结果十分吻合。通过使用扰动处理和适当的近似,推导出了光旋转的分析表达式,简洁地阐明了参数调制下原子排列的动力学。这些成果可用于推进对准磁强计的发展,该装置旨在探测地球物理范围内的微弱磁信号。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Physics D: Applied Physics
Journal of Physics D: Applied Physics 物理-物理:应用
CiteScore
6.80
自引率
8.80%
发文量
835
审稿时长
2.1 months
期刊介绍: This journal is concerned with all aspects of applied physics research, from biophysics, magnetism, plasmas and semiconductors to the structure and properties of matter.
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