Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with $7.2 \times 10^{-18}$ Total Uncertainty
Bing-Kun Lu1,2 , Zhen Sun1,2 , Tao Yang1 , Yi-Ge Lin1* , Qiang Wang1 , Ye Li1 , Fei Meng1 , Bai-Ke Lin1 , Tian-Chu Li1 , and Zhan-Jun Fang1*
1 Division of Time and Frequency Metrology, National Institute of Metrology, Beijing 100029, China2 Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Abstract ：NIM-Sr2 optical lattice clock has been developed on the Changping campus of National Institute of Metrology (NIM). Considering the limitations in NIM-Sr1, several improved parts have been designed including a differential pumping stage in the vacuum system, a permanent magnet Zeeman slower, water-cooled anti-Helmholtz coils, an extended viewport for Zeeman slower, etc. A clock laser with a short-time stability better than $3\times10^{-16}$ is realized based on a self-designed 30-cm-long ultra-low expansion cavity. The systematic frequency shift has been evaluated to an uncertainty of $7.2\times 10^{-18}$, with the uncertainty of BBR shift and the collisional frequency shift being an order of magnitude lower than the last evaluation of NIM-Sr1.
收稿日期: 2022-04-22
出版日期: 2022-07-20
:
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)
引用本文:
. [J]. 中国物理快报, 2022, 39(8): 80601-.
链接本文:
https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/39/8/080601
或
https://cpl.iphy.ac.cn/CN/Y2022/V39/I8/80601
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2022, Vol. 39 
