Open AccessFrequency measurement of a Sr lattice clock using an SI-second-referenced optical frequency comb linked by a global positioning system (GPS)
Author(s) -
Feng−Lei Hong,
Masao Takamoto,
Ryoichi Higashi,
Yasuhiro Fukuyama,
Jie Jiang,
Hidetoshi Katori
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.005253
Subject(s) - atomic clock , optical frequency comb , optics , global positioning system , frequency comb , flywheel , physics , allan variance , laser , metrology , optical lattice , telecommunications , computer science , standard deviation , mathematics , engineering , superfluidity , statistics , quantum mechanics , aerospace engineering
We have established a transportable frequency measurement system using an optical frequency comb linked to a commercial Cs atomic clock, which is in turn linked to international atomic time (TAI) through global positioning system (GPS) time. An iodine-stabilized Nd:YAG laser is used as a flywheel in the frequency measurement system. This system is used to measure the absolute frequency of the clock transition of (87)Sr in an optical lattice. We obtained a fractional uncertainty of 2x10(-14) in the frequency measurement with a total averaging time of ~ 10(5) s over 9 days.