Abstract

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 2.7×10⁻¹³τ^−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.

© 2015 Chinese Laser Press

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