12 September 2011 Recent progress of time and frequency research in NIM
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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.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yige Lin, Yige Lin, Zhanjun Fang, Zhanjun Fang, Tianchu Li, Tianchu Li, } "Recent progress of time and frequency research in NIM", Proc. SPIE 8132, Time and Frequency Metrology III, 81320E (12 September 2011); doi: 10.1117/12.892944; https://doi.org/10.1117/12.892944


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