摘要
We report a locking mode in which the local oscillator （LO） is locked to an atomic fountain and calibration of the residual frequency drift （RFD）. In this running mode, the locked LO outputs a standard frequency signal, and a short-term fractional frequency stability of 2.7 × 10-13-1/2 is achieved. Due to the frequency drift of the LO in free running mode, a systematic frequency bias, or RFD, exists after being locked by the atomic fountain. We analyze and measure the RFD with a value of -3（2） × 10-16. A sectionalized post-process method is adopted to calibrate the RFD.
We report a locking mode in which the local oscillator （LO） is locked to an atomic fountain and calibration of the residual frequency drift （RFD）. In this running mode, the locked LO outputs a standard frequency signal, and a short-term fractional frequency stability of 2.7 × 10-13-1/2 is achieved. Due to the frequency drift of the LO in free running mode, a systematic frequency bias, or RFD, exists after being locked by the atomic fountain. We analyze and measure the RFD with a value of -3（2） × 10-16. A sectionalized post-process method is adopted to calibrate the RFD.
基金
supported by the National Natural Science Foundation of China under Grant Nos.61275204,91336105,and 11404353
