Closed-loop system of Cesium atomic magnetometer and its characteristics

After selecting proper frequency tracking method and designing of the Digital Automatic Frequency Tracking (DAFT) system, a closed-loop system of Cesium atomic magnetometer is implemented. Some characteristics of the closed-loop system are analyzed in detail through experiments. Experiment results show that the peak to peak jitter is no more than 3pT within 1 minute and 9pT within 1 hour, the closed-loop sensitivity is 0.12pT/Hz1/2, and the response bandwidth is only 1.2Hz in 3dB.