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Proceedings Paper

Recent progress of time and frequency research in NIM
Author(s): Yige Lin; Zhanjun Fang; Tianchu Li
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Paper Abstract

The recent evaluation of the second cesium fountain NIM5 at National Institute of Metrology(NIM) shows a total relative uncertainty of 2×10-15. The strontium optical clock project has successfully transferred atoms from broad line cooling to narrow line cooling. About 107 88Sr atoms have been cooled down to 2uK, ready to be loaded into 1 dimensional (1D) optical lattice. The clock transition interrogation laser is locked to a horizontally oriented high finesse cavity. The linewidth of this laser is reduced to 100Hz level. A fiber based optical frequency comb is being built, which can be used to synthesize ultra-stable microwave frequency for the fountains in the future.

Paper Details

Date Published: 12 September 2011
PDF: 6 pages
Proc. SPIE 8132, Time and Frequency Metrology III, 81320E (12 September 2011); doi: 10.1117/12.892944
Show Author Affiliations
Yige Lin, Beijing Institute of Technology (China)
National Institute of Metrology (China)
Zhanjun Fang, National Institute of Metrology (China)
Tianchu Li, National Institute of Metrology (China)

Published in SPIE Proceedings Vol. 8132:
Time and Frequency Metrology III
Tetsuya Ido; Thomas R. Schibli, Editor(s)

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