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Proceedings Paper

Advances in strontium optical lattice clocks at NIM
Author(s): 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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Paper 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.

Paper Details

Date Published: 25 February 2020
PDF: 7 pages
Proc. SPIE 11296, Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II, 112961H (25 February 2020); doi: 10.1117/12.2552695
Show Author Affiliations
Zhen Sun, Tsinghua Univ. (China)
National Institute of Metrology (China)
Tao Yang, National Institute of Metrology (China)
Yige Lin, National Institute of Metrology (China)
Qiang Wang, National Institute of Metrology (China)
Ye Li, National Institute of Metrology (China)
Bingkun Lu, National Institute of Metrology (China)
Fei Meng, National Institute of Metrology (China)
Shiying Cao, National Institute of Metrology (China)
Baike Lin, National Institute of Metrology (China)
Tianchu Li, National Institute of Metrology (China)
Zhanjun Fang, National Institute of Metrology (China)


Published in SPIE Proceedings Vol. 11296:
Optical, Opto-Atomic, and Entanglement-Enhanced Precision Metrology II
Selim M. Shahriar; Jacob Scheuer, Editor(s)

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