Chin. Phys. Lett.  2015, Vol. 32 Issue (09): 090601    DOI: 10.1088/0256-307X/32/9/090601
GENERAL |
First Evaluation and Frequency Measurement of the Strontium Optical Lattice Clock at NIM
LIN Yi-Ge1**, WANG Qiang1,2, LI Ye1,2, MENG Fei1, LIN Bai-Ke1,2, ZANG Er-Jun1, SUN Zhen1, FANG Fang1, LI Tian-Chu1, FANG Zhan-Jun1
1Division of Time and Frequency, National Institute of Metrology (NIM), Beijing 100013
2Department of Precision Instrument, Tsinghua University, Beijing 100084
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Abstract

An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10−16. To measure its absolute frequency with respect to NIM's cesium fountain clock NIM5, the frequency of a flywheel H-maser of NIM5 is transferred to the Sr laboratory through a 50-km-long fiber. A fiber optical frequency comb, phase-locked to the reference frequency of this H-maser, is used for the optical frequency measurement. The absolute frequency of this Sr clock is measured to be 429228004229873.7(1.4) Hz.

Received: 31 July 2015      Published: 02 October 2015
PACS:  06.30.Ft (Time and frequency)  
  42.62.Fi (Laser spectroscopy)  
  32.70.Jz (Line shapes, widths, and shifts)  
  37.10.Jk (Atoms in optical lattices)  
  42.62.Eh (Metrological applications; optical frequency synthesizers for precision spectroscopy)  
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Cite this article:   
LIN Yi-Ge, WANG Qiang, LI Ye et al  2015 Chin. Phys. Lett. 32 090601
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http://cpl.iphy.ac.cn/10.1088/0256-307X/32/9/090601       OR      http://cpl.iphy.ac.cn/Y2015/V32/I09/090601
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LIN Yi-Ge
WANG Qiang
LI Ye
MENG Fei
LIN Bai-Ke
ZANG Er-Jun
SUN Zhen
FANG Fang
LI Tian-Chu
FANG Zhan-Jun

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