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Chin. Phys. B, 2018, Vol. 27(2): 023701    DOI: 10.1088/1674-1056/27/2/023701

Strontium optical lattice clock at the National Time Service Center

Ye-Bing Wang(王叶兵)1,2, Mo-Juan Yin(尹默娟)1, Jie Ren(任洁)1, Qin-Fang Xu(徐琴芳)1, Ben-Quan Lu(卢本全)1,2, Jian-Xin Han(韩建新)1,2, Yang Guo(郭阳)1,2, Hong Chang(常宏)1
1. CAS Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Xi'an 710600, China;
2. University of Chinese Academy of Sciences(CAS), Beijing 100049, China

We report the 87Sr optical lattice clock developed at the National Time Service Center. We achieved a closed-loop operation of the optical lattice clock based on 87Sr atoms. The linewidth of the spin-polarized clock peak is 3.9 Hz with a clock laser pulse length of 300 ms, which corresponds to a Fourier-limited linewidth of 3 Hz. The fitting of the in-loop error signal data shows that the instability is approximately 5×10-15τ-1/2, affected primarily by the white noise. The fractional frequency difference averages down to 5.7×10-17 for an averaging time of 3000 s.

Keywords:  optical clock      optical lattice      strontium atoms      stability  
Received:  01 December 2017      Revised:  18 December 2017      Accepted manuscript online: 
PACS:  37.10.Jk (Atoms in optical lattices)  
  32.70.Jz (Line shapes, widths, and shifts)  
  06.30.Ft (Time and frequency)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  

Project supported by the National Natural Science Foundation of China (Grant Nos. 11474282 and 61775220), the Key Research Project of Frontier Science of the Chinese Academy of Sciences (Grant No. QYZDB-SSW-JSC004), and the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No. XDB21030700).

Corresponding Authors:  Hong Chang     E-mail:
About author:  37.10.Jk; 32.70.Jz; 06.30.Ft; 42.62.Eh

Cite this article: 

Ye-Bing Wang(王叶兵), Mo-Juan Yin(尹默娟), Jie Ren(任洁), Qin-Fang Xu(徐琴芳), Ben-Quan Lu(卢本全), Jian-Xin Han(韩建新), Yang Guo(郭阳), Hong Chang(常宏) Strontium optical lattice clock at the National Time Service Center 2018 Chin. Phys. B 27 023701

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