Theory of a 4He parametric-resonance magnetometer based on atomic alignment
Theory of a 4He parametric-resonance magnetometer based on atomic alignment
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DOI：
10.1103/physreva.98.053431
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发表时间：
2018-11-26
影响因子：
2.9
通讯作者：
Palacios-Laloy, Agustin
中科院分区：
文献类型：
--
作者：
Beato, Francois;Belorizky, Elie;Palacios-Laloy, Agustin
在参数共振磁强计中，光泵原子受到射频场的作用，使得人们可以测量很低磁场的分量。在这里，代替使用圆偏振光来创建原子取向，如在先前的作品中，使用线偏振光来创建原子排列。由Polonsky和Cohen-Tannoudji引入的缀饰原子形式主义被扩展，并允许将这种情况映射到对齐原子上的更简单的Hanle效应。所有的对齐张量分量和光电探测信号的解析表达式获得的汉勒磁强计和PRM。一个两个射频场对准PRM显示几个改进，从它的方向对应，提供长期的第三轴灵敏度和较低的退化，通过使用一个单一的射频场获得的一轴灵敏度。这些特性是由于泵浦光作用于双射频场修饰的原子时产生的表观去偏振效应。实验测量显示出良好的协议与理论预测。
In parametric-resonancc magnetometers (PRMs), optically pumped atoms subject to rf fields allow one to measure the components of a very low magnetic field. Here, instead of using a circularly polarized light for creating atomic orientation, as in previous works, a linearly polarized light is used for creating atomic alignment. A dressed-atom formalism introduced by Polonsky and Cohen-Tannoudji is extended and allows one to map this situation to a simpler Hanle effect on aligned atoms. Analytical expressions for all alignment tensor components and photodetection signals are obtained for both the Hanle magnetometer and PRMs. A two-rf field alignment PRM is shown to display several improvements from its orientation counterpart, providing a secular third axis sensitivity and a lower degradation from the one-axis sensitivity obtained by using a single rf field. These specificities are shown to result from the apparent depolarization of the pumping light acting on the atom dressed by two-rf fields. Experimental measurements showing a good agreement with the theoretical predictions are presented.