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25 February 2020 Advances in strontium optical lattice clocks at NIM
Zhen Sun, Tao Yang, Yige Lin, Qiang Wang, Ye Li, Bingkun Lu, Fei Meng, Shiying Cao, Baike Lin, Tianchu Li, Zhanjun Fang
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Proceedings Volume 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II; 112961H (2020) https://doi.org/10.1117/12.2552695
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Two strontium optical lattice clocks (Sr1 and Sr2) are being built at National Institute of Metrology(NIM) of China. Sr1 was firstly evaluated in 2015, and later equipped with a new clock laser based on a 30 cm reference cavity, which helped to improve its stability. Sr2 is built on a new campus of NIM, which has some different designs compared to Sr1, for example, a permanent magnets based Zeeman slower, a differential pumping stage, and a robust laser system. A time interleaved self-comparison campaign of Sr2 of more than 7 days shows an up-time of ~90% and a measurement stability of 3.7×10-15/√𝜏 with a 10 cm ULE cavity based clock laser. The link between these two optical clocks, that consists of two fiber optical frequency combs and a 54 km fiber connection, are being constructed. The comparison of these two clocks is planned in the near future.
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Zhen Sun, Tao Yang, Yige Lin, Qiang Wang, Ye Li, Bingkun Lu, Fei Meng, Shiying Cao, Baike Lin, Tianchu Li, and Zhanjun Fang "Advances in strontium optical lattice clocks at NIM", Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 112961H (25 February 2020); https://doi.org/10.1117/12.2552695
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KEYWORDS
Clocks
Strontium
Optical lattice clocks
Laser stabilization
Optical clocks
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