Main > Chinese Optics Letters >  Volume 13 >  Issue 9 >  Page 091201 > Article
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Accepted: Jun. 19, 2015

Posted: Jan. 23, 2019

Published Online: Sep. 14, 2018

The Author Email: Rong Wei (weirong@siom.ac.cn)

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Yuanbo Du, Rong Wei, Richang Dong, Fan Zou, Jinda Lin, Wenli Wang, Yuzhu Wang. Residual frequency drift in an atomic fountain clock[J]. Chinese Optics Letters, 2015, 13(9): 091201

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## 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.