title: Frequency measurement of a Sr lattice clock using an SI-second-referenced optical frequency comb linked by a global positioning system (GPS).
abstract: 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.
authors.forename: Feng-Lei
authors.initials: FL
authors.lastname: Hong
authors.forename: Masao
authors.initials: M
authors.lastname: Takamoto
authors.forename: Ryoichi
authors.initials: R
authors.lastname: Higashi
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Fukuyama
authors.forename: Jie
authors.initials: J
authors.lastname: Jiang
authors.forename: Hidetoshi
authors.initials: H
authors.lastname: Katori