Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with 7.2 × 10-18Total Uncertainty

Bing Kun Lu; Zhen Sun; Tao Yang; Yi Ge Lin; Qiang Wang; Ye Li; Fei Meng; Bai Ke Lin; Tian Chu Li; Zhan Jun Fang

doi:10.1088/0256-307X/39/8/080601

Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with 7.2 × 10^-18Total Uncertainty

Bing Kun Lu, Zhen Sun, Tao Yang, Yi Ge Lin^*, Qiang Wang, Ye Li, Fei Meng, Bai Ke Lin, Tian Chu Li, Zhan Jun Fang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

14 Citations (Scopus)

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 × 10-16 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 × 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.

Original language	English
Article number	080601
Journal	Chinese Physics Letters
Volume	39
Issue number	8
DOIs	https://doi.org/10.1088/0256-307X/39/8/080601
Publication status	Published - 1 Jul 2022
Externally published	Yes

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Lu, B. K., Sun, Z., Yang, T., Lin, Y. G., Wang, Q., Li, Y., Meng, F., Lin, B. K., Li, T. C., & Fang, Z. J. (2022). Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with 7.2 × 10^-18Total Uncertainty. Chinese Physics Letters, 39(8), Article 080601. https://doi.org/10.1088/0256-307X/39/8/080601

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title = "Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with 7.2 × 10-18Total Uncertainty",

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 × 10-16 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 × 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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AU - Lu, Bing Kun

AU - Sun, Zhen

AU - Yang, Tao

AU - Lin, Yi Ge

AU - Wang, Qiang

AU - Li, Ye

AU - Meng, Fei

AU - Lin, Bai Ke

AU - Li, Tian Chu

AU - Fang, Zhan Jun

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AB - 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 × 10-16 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 × 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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Improved Evaluation of BBR and Collisional Frequency Shifts of NIM-Sr2 with 7.2 × 10^-18Total Uncertainty

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