Precisely Mapping the Absolute Magnetic Field in Vacuum by an Optical Ramsey Atom Interferometer
Precisely Mapping the Absolute Magnetic Field in Vacuum by an Optical Ramsey Atom Interferometer
复制标题
利用光学拉姆齐原子干涉仪精确绘制真空中的绝对磁场
DOI：
10.1103/physrevapplied.15.054062
复制
发表时间：
2021-05-27
影响因子：
4.6
通讯作者：
Hu, Zhong-Kun
中科院分区：
文献类型：
--
作者：
Deng, Xiao-Bing;Xu, Yao-Yao;Hu, Zhong-Kun
磁敏感子级中的原子构成了用于绝对磁场测量的天然传感器，在此探索形成用于确定磁场分布的光学拉姆齐干涉仪。光学Ramsey原子干涉仪提供了一种方便的方法来映射真空中的磁场。与常用的拉曼光谱法相比，Ramsey干涉仪不仅可以提高灵敏度，而且可以显著地抑制交流斯塔克效应的贡献。此外，在这项工作中，磁敏感原子的速度选择，这提高了空间分辨率的磁强计以及拉姆齐条纹的对比度。即使在500 μ s的询问时间内，磁场测量的短期灵敏度也达到了1.4nT/Hz ~（1/2）。这种绝对磁场测量方法在基于原子干涉的精密磁场测量中有着广泛的应用前景。
Atoms in magnetically sensitive sublevels constitute a natural sensor for absolute magnetic field measurements, which are explored here to form an optical Ramsey interferometer for determining the magnetic field distribution. An optical Ramsey atom interferometer provides a convenient way to map a magnetic field in vacuum. In comparison with the often used Raman spectroscopy method, a Ramsey interferometer can not only improve the sensitivity, but also dramatically suppress the contribution of the ac Stark effect. Furthermore, in this work, the magnetically sensitive atoms are velocity-selected, which improves the spatial resolution for the magnetometer as well as the contrast of the Ramsey fringes. A short-term sensitivity of 1.4 nT/Hz1/2 for magnetic field measurement is finally achieved even with an interrogation time as short as 500 & micro;s. The presented approach for absolute magnetic field measurement is expected to find wide applications in atom-interferometry-based precision measurements.