Savukov Igor, Boshier Malcolm G
Physics Division, Los Alamos National Laboratory, Los Alamos, NM 87545, USA.
Sensors (Basel). 2016 Oct 13;16(10):1691. doi: 10.3390/s16101691.
Atomic magnetometers (AM) are finding many applications in biomagnetism, national security, industry, and science. Fiber-coupled (FC) designs promise to make them compact and flexible for operation. Most FC designs are based on a single-beam configuration or electrical heating. Here, we demonstrate a two-beam FC AM with laser heating that has 5 fT/Hz sensitivity at low frequency (50 Hz), which is higher than that of other fiber-coupled magnetometers and can be improved to the sub-femtotesla level. This magnetometer is widely tunable from DC to very high frequencies (as high as 100 MHz; the only issue might be the application of a suitable uniform and stable bias field) with a sensitivity under 10 fT/Hz and can be used for magneto-encephalography (MEG), magneto-cardiography (MCG), underground communication, ultra-low MRI/NMR, NQR detection, and other applications.
原子磁力仪（AM）在生物磁学、国家安全、工业和科学领域有诸多应用。光纤耦合（FC）设计有望使其结构紧凑且操作灵活。大多数FC设计基于单光束配置或电加热。在此，我们展示了一种采用激光加热的双光束FC AM，其在低频（50 Hz）下具有5 fT/Hz的灵敏度，高于其他光纤耦合磁力仪，并且可提升至飞特斯拉以下水平。该磁力仪从直流到甚高频（高达100 MHz；唯一的问题可能是施加合适的均匀且稳定的偏置场）具有广泛的可调性，灵敏度低于10 fT/Hz，可用于脑磁图（MEG）、心磁图（MCG）、地下通信、超低场磁共振成像/核磁共振（MRI/NMR）、核磁共振量子检测（NQR）及其他应用。
