1Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800 2University of Chinese Academy of Sciences, Beijing 100039
Abstract：The Dick effect is an important factor limiting the frequency stability of sequentially-operating atomic frequency standards. Here we study the impact of the Dick effect in the integrating sphere cold atom clock (ISCAC). To reduce the impact of the Dick effect, a 5 MHz local oscillator with ultra-low phase noise is selected and a new microwave synthesizer is built in-house. Consequently, the phase noise of microwave signal is optimized. The contribution of the Dick effect is reduced to $2.5\times 10^{-13}\tau ^{-1/2}$ ($\tau $ is the integrating time). The frequency stability of $4.6\times 10^{-13}\tau ^{-1/2}$ is achieved. The development of this optimization can promote the space applications of the compact ISCAC.
Wang X C, Cheng H D, Xiao L, Zheng B C, Meng Y L and Liu L 2012 Acta Optic Sin.10 080201 (in Chinese)
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Liu P, Meng Y L, Wan J Y, Wang X M, Wang Y N, Xiao L, Cheng H D and Liu L 2016 8th Symposium on Frequency Standards and Metrology (Potsdam Germany 12–16 October 2016) 723 012007
2017, Vol. 34 
