关键词: 原子钟/
光钟/
光晶格/
锶原子
English Abstract
Strontium optical lattice clock
Lin Yi-Ge1,2,Fang Zhan-Jun1,2
1.National Institute of Metrology, Beijing 100029, China;
2.National Time and Frequency Metrology Center, Beijing 100029, China
Fund Project:Project supported by the National Key R&D Program of China (Grant Nos. 2016YFF0200201, 2017YFA0304404) and the National Natural Science Foundation of China (Grant Nos. 91336212, 91436104, 91736310).Received Date:04 June 2018
Accepted Date:10 July 2018
Published Online:20 August 2019
Abstract:The strontium optical lattice clock has experienced a rapid development since the beginning of the 21st century. Its relative frequency uncertainty, on the order of 10-18, has surpassed that of the cesium fountain clock, the current primary standard for time and frequency. This supreme level of precision reflects one of the most advanced measurement capabilities of mankind. This article reviews the current progress of the strontium optical lattice clock, and describes its key components and techniques, including high-resolution spectroscopy, close-loop operation, evaluation of systematic shifts, and absolute frequency measurement. The applications and future outlook of the strontium clock are also summarized.
Keywords: atomic clock/
optical clock/
optical lattice/
strontium
