Lu Fei, Li Bo, Lu Jixi, Ye Mao, Ning Xiaolin, Han Bangcheng
Opt Lett. 2022 Aug 1;47(15):3908-3911. doi: 10.1364/OL.465832.
The emerging multi-channel spin-exchange relaxation-free (SERF) atomic magnetometer is a promising candidate for non-intrusive biomagnetism imaging. In this study, we propose a scanning 9-channel SERF magnetometer based on an acousto-optic modulator (AOM). Using the diffraction light of the AOM as the probe laser (with a low laser power of 1.7 mW), 9 channels were rapidly scanned by altering the diffraction angle. The scanning imaging scheme provides a new, to the best of our knowledge, approach for multi-channel magnetic field measurement and realizes a single-channel sensitivity of about 3 fT/Hz, a spatial resolution of 0.6 mm, and a time resolution of about 2.7 ms, which is well suited for real-time extremely weak magnetic field imaging.
新兴的多通道自旋交换无弛豫（SERF）原子磁力仪是用于非侵入式生物磁成像的一个有前途的候选者。在本研究中，我们提出了一种基于声光调制器（AOM）的扫描9通道SERF磁力仪。利用AOM的衍射光作为探测激光（激光功率低至1.7 mW），通过改变衍射角对9个通道进行快速扫描。据我们所知，这种扫描成像方案为多通道磁场测量提供了一种新方法，并实现了约3 fT/Hz的单通道灵敏度、0.6 mm的空间分辨率和约2.7 ms的时间分辨率，非常适合实时极弱磁场成像。
