Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer

Details Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer Measuring the frequency of a Sr optical lattice clock using a 120-km coherent optical transfer

2008-11-12

arxiv.org/abs/0811.1816v1

Physics

Atomic Physics

14 pages, 3 figures

Scientific paper

10.1364/OL.34.000692

We demonstrate a precision frequency measurement using a phase-stabilized 120-km optical fiber link over a physical distance of 50 km. The transition frequency of the 87Sr optical lattice clock at the University of Tokyo is measured to be 429228004229874.1(2.4) Hz referenced to international atomic time (TAI). The measured frequency agrees with results obtained in Boulder and Paris at a 6*10^-16 fractional level, which matches the current best evaluations of Cs primary frequency standards. The results demonstrate the excellent functions of the intercity optical fibre link, and the great potential of optical lattice clocks for use in the redefinition of the second.

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