The optical cavity with high quality factor (Q) has been successfully employed to improve the sensitivity of magnetometer. However, complex system design and tedious data processing hinder the progress of application, since synchronized with other equipments and undergo additional post-processing. To overcome the limitation, we propose a single-loop frequency-locking (SLFL) optomagnetic (OM) signal solution system (SLFL-OMSS). SLFL-OMSS solution obtained a scale factor of 0.17mV μT⁻¹ and the peak sensitivity is 44.1 fT/Hz^1/2 at 200kHz. SLFL-OMSS reduces the calculating and complexity of the OM sensor system, which provides an efficient way for achieving a high-sensitivity OM sensing.

具有高品质因数（Q）的光腔已成功用于提高磁力计的灵敏度。然而，复杂的系统设计和繁琐的数据处理阻碍了应用的进程，因为与其他设备同步并经过额外的后处理。为了克服这个限制，我们提出了一种单环锁频（SLFL）光磁（OM）信号解决方案系统（SLFL-OMSS）。SLFL-OMSS 解决方案获得了 0.17mV μ T ^-1的比例因子，在 200kHz 时的峰值灵敏度为 44.1 fT/Hz ^1/2。SLFL-OMSS 降低了 OM 传感器系统的计算和复杂性，为实现高灵敏度 OM 传感提供了一种有效的方法。