Wang Haidong, Wu Teng, Wang He, Liu Yang, Mao Xinmin, Peng Xiang, Guo Hong
Opt Express. 2020 May 11;28(10):15081-15089. doi: 10.1364/OE.390375.
An all-optical self-oscillating He atomic magnetometer with a large dynamic range of the magnetic field is demonstrated. This device has the advantage of the fast response of the self-oscillating magnetometer and is not affected by the systematic errors originated from the radio-frequency field. It is also free from the nonlinear Zeeman effect in large magnetic fields. We use a liquid crystal to adjust the phase shift, which is independent of frequency. Results show that our self-oscillating He magnetometer exhibits a response time of 0.2 ms for a step signal of 3600 nT, and the noise floor reaches 1.7 pT / Hz for frequencies from 2 Hz to 500 Hz. It can work stably in magnetic fields ranging from 2500 nT to 103000 nT. Compared with the commercial self-oscillating cesium atomic magnetometer (Scintrex, CS-3), the self-oscillating He atomic magnetometer has shown a better gradient tolerance in larger magnetic field. This magnetometer is ideally suited in magnetic observatories to monitor geomagnetic field requiring large dynamic range and high bandwidth.
展示了一种具有大磁场动态范围的全光自振荡氦原子磁力仪。该装置具有自振荡磁力仪响应速度快的优点，不受射频场产生的系统误差影响。它在大磁场中也不存在非线性塞曼效应。我们使用液晶来调节与频率无关的相移。结果表明，对于3600 nT的阶跃信号，我们的自振荡氦磁力仪的响应时间为0.2 ms，在2 Hz至500 Hz频率范围内，本底噪声达到1.7 pT / Hz。它可以在2500 nT至10³000 nT的磁场中稳定工作。与商用自振荡铯原子磁力仪（Scintrex，CS - 3）相比，自振荡氦原子磁力仪在更大磁场中表现出更好的梯度耐受性。该磁力仪非常适合在磁观测站中用于监测需要大动态范围和高带宽的地磁场。
