Intermittent optical frequency measurements to reduce the dead time uncertainty of frequency link. (15th October 2015)

• Record Type: Journal Article
• Authors: Hachisu, Hidekazu; Ido, Tetsuya
• Is Part Of: Japanese journal of applied physics. Volume 54:Number 11(2015:Nov.)
• Publication Date: 2015-10-15
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.54.112401
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: The absolute frequency of the 87 Sr lattice clock transition was evaluated with an uncertainty of 1.1 × 10 −15 using a frequency link to the international atomic time (TAI). The frequency uncertainty of a hydrogen maser used as a transfer oscillator was reduced by homogeneously distributed intermittent measurement over a five-day grid of TAI. Three sets of four or five days measurements as well as systematic uncertainty of the clock at 8.6 × 10 −17 have resulted in an absolute frequency of 87 Sr 1 S0 – 3 P0 clock transition to be 429 228 004 229 872.85 (47) Hz.