Intrinsic radio-frequency gradiometer
Intrinsic radio-frequency gradiometer
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DOI：
10.1103/physreva.106.053113
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发表时间：
2022-11-23
影响因子：
2.9
通讯作者：
Romalis, Michael V.
中科院分区：
文献类型：
--
作者：
Cooper, Robert J.;Prescott, David W.;Romalis, Michael V.
对比了N/2种光泵原子磁强计的几何结构，其中一种是高功率探测束，穿透原子较少；另一种是低功率，多次穿透。对这些条件下的理论噪声灵敏度进行了建模，并与实验N/值进行了比较，后者的灵敏度为0.19+/-0.02 FT/Hz。此外，还给出了选择探头参数以优化灵敏度的一般方法。通过使用波长为2的波片，这两个系统还被配置为充当本征梯度计，从而能够抑制共模干扰。在这两种几何结构中，共模干扰都降低了50分贝以上。
N/ Two optically pumped atomic magnetometer geometries, with sub-fT/ Hz sensitivity for radio frequencies, are contrasted: one with a probe beam of high power and few passes through the atoms, the other with low power and many passes. Theoretical noise sensitivity for these conditions is modeled and compared to experimental N/ values, with the latter geometry achieving a sensitivity of 0.19 +/- 0.02 fT/ Hz. Further, a general approach for choosing probe parameters to optimize sensitivity is given. With the use of a lambda/2 wave plate, both systems are also configured to act as an intrinsic gradiometer, enabling the rejection of common-mode interference. Common-mode interference is reduced by over 50 dB in both geometries.