We present an optically pumped magnetometer working in a new operational mode—the light-shift dispersed Mz (LSD-Mz) mode. It is realized combining various features; (1) high power off-resonant optical pumping; (2) Mz configuration, where pumping light and magnetic field of interest are oriented parallel to each other; (3) use of small alkali metal vapor cells of identical properties in integrated array structures, where two such cells are pumped by circularly polarized light of opposite helicity; and (4) subtraction of the Mz signals of these two cells. The LSD-Mz magnetometer’s performance depends on the inherent and very complex interplay of input parameters. In order to find the configuration of optimal magnetometer resolution, a sensitivity analysis of the input parameters by means of Latin Hypercube Sampling was carried out. The resulting datasets of the multi-dimensional parameter space exploration were assessed by a subsequent physically reasonable interpretation. Finally, the best shot-noise limited magnetic field resolution was determined within that parameter space. As the result, using two 50 mm3 integrated vapor cells a magnetic field resolution below 10 fT/√Hz at Earth’s magnetic field strength is possible.
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机译:我们提出了一种光泵浦磁力计,其工作在新的操作模式下-光移分散Mz(LSD-Mz)模式。结合各种功能实现; (1)大功率失谐光泵浦; (2)Mz配置,其中泵浦光和感兴趣的磁场彼此平行定向; (3)在整体阵列结构中使用性质相同的小型碱金属蒸气池,其中两个此类池由螺旋度相反的圆偏振光泵浦; (4)减去这两个细胞的Mz信号。 LSD-Mz磁力计的性能取决于输入参数固有且非常复杂的相互作用。为了找到最佳磁力计分辨率的配置,通过拉丁超立方体采样对输入参数进行了灵敏度分析。多维参数空间探索的所得数据集通过后续的物理合理解释进行了评估。最后,在该参数空间内确定了最佳散粒噪声限制的磁场分辨率。结果,使用两个50 mm 3 sup>集成蒸汽电池,可以在地球磁场强度下实现低于10 fT /√Hz的磁场分辨率。
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