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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* |
1Division of Time and Frequency Metrology, National Institute of Metrology, Beijing 100029, China
2Department of Precision Instrument, Tsinghua University, Beijing 100084, China
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| Cite this article: |
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Bing-Kun Lu, Zhen Sun, Tao Yang et al 2022 Chin. Phys. Lett. 39 080601 |
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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.
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Received: 22 April 2022
Published: 20 July 2022
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| PACS: |
06.30.Ft
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(Time and frequency)
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42.62.Fi
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(Laser spectroscopy)
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32.70.Jz
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(Line shapes, widths, and shifts)
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37.10.Jk
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(Atoms in optical lattices)
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42.62.Eh
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(Metrological applications; optical frequency synthesizers for precision spectroscopy)
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