Vector Magnetometry Exploiting Phase-Geometry Effects in a Double-Resonance Alignment Magnetometer
Vector Magnetometry Exploiting Phase-Geometry Effects in a Double-Resonance Alignment Magnetometer
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DOI：
10.1103/physrevapplied.10.034035
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发表时间：
2018-09-18
影响因子：
4.6
通讯作者：
Riis, Erling
中科院分区：
文献类型：
--
作者：
Ingleby, Stuart J.;O'Dwyer, Carolyn;Riis, Erling
双谐振光泵磁强计具有动态范围宽、灵敏度高等优点，是一种极具吸引力的非屏蔽磁场测量仪器。线偏振泵浦光的使用在原子样品中产生排列，原子样品在局部静态磁场中演化，并由共振外场微扰驱动，调制传输光的偏振。实验证明，在传输的极化信号中，观测到的一次和二次谐波分量的幅度和相位包含了足够的信息来测量静磁场的大小和方向。我们描述了一个实验室系统，用于对这些效应进行实验测量，并验证了观测信号的理论推导。我们演示了在不同静场方向下的矢量场跟踪，表明可以同时观测到静场大小和方向，在最灵敏的场方向上，实验实现的分辨率分别为1.7pT和0.63mrad。
Double-resonance optically pumped magnetometers are an attractive instrument for unshielded magnetic-field measurements due to their wide dynamic range and high sensitivity. The use of linearly polarized pump light creates alignment in the atomic sample, which evolves in the local static magnetic field, and is driven by a resonant applied field perturbation, modulating the polarization of transmitted light. We demonstrate experimentally that the amplitude and phase of observed first- and second-harmonic components in the transmitted polarization signal contain sufficient information to measure the static-magnetic-field magnitude and orientation. We describe a laboratory system for experimental measurements of these effects and verify a theoretical derivation of the observed signal. We demonstrate vector-field tracking under varying static-field orientations and show that the static-field magnitude and orientation may be observed simultaneously, with an experimentally realized resolution of 1.7 pT and 0.63 mrad in the most sensitive field orientation.