All-optical spin locking in alkali-metal-vapor magnetometers
All-optical spin locking in alkali-metal-vapor magnetometers
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DOI：
10.1103/physreva.105.043109
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发表时间：
2022-04-11
影响因子：
2.9
通讯作者：
Budker, Dmitry
中科院分区：
文献类型：
--
作者：
Bao, Guzhi;Kanta, Dimitra;Budker, Dmitry
在地球物理磁场范围内，非线性塞曼效应会引起磁共振谱线的分裂和不对称。我们提出了一种基于自旋锁定的全光学方案来抑制非线性塞曼效应。该方案实现自旋锁定通过一个有效的振荡磁场的形式AC斯塔克位移诱导的强度和偏振调制的激光束。这导致在地球场范围内具有类似于100 Hz宽度的多分量非对称磁共振线塌陷成具有25 Hz中心分量宽度的峰值。预计该技术将广泛适用于实际磁力测量，通过增加磁共振振幅和减小其宽度，有可能提高地球测量磁力计的灵敏度和准确度。全光学方法的优点是当它们用于梯度测量或阵列布置中时，附近的传感器之间没有串扰。
The nonlinear Zeeman effect can induce splittings and asymmetries of magnetic-resonance lines in the geophysical magnetic-field range. We demonstrate an all-optical scheme, based on spin locking, to suppress the nonlinear Zeeman effect. This scheme achieves spin locking via an effective oscillating magnetic field in the form of AC Stark shifts induced by an intensity- and polarization-modulated laser beam. This results in the collapse of the multicomponent asymmetric magnetic-resonance line with similar to 100 Hz width in the Earth-field range into a peak with a central component width of 25 Hz. The technique is expected to be broadly applicable in practical magnetometry, potentially boosting the sensitivity and accuracy of Earth-surveying magnetometers by increasing the magnetic-resonance amplitude and decreasing its width. An advantage of the all-optical approach is the absence of crosstalk between nearby sensors when they are used in a gradiometric or array arrangement.