The absolute frequency of the 87Sr optical clock transition

Details The absolute frequency of the 87Sr optical clock transition The absolute frequency of the 87Sr optical clock transition

2008-04-29

arxiv.org/abs/0804.4509v1

Metrologia 45, 539-548 (2008).

Physics

Atomic Physics

Scientific paper

10.1088/0026-1394/45/5/008

The absolute frequency of the 1S0-3P0 clock transition of 87Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6x10-16 represents one of the most accurate measurements of an atomic transition frequency to date. After a detailed study of systematic effects, which reduced the total systematic uncertainty of the Sr lattice clock to 1.5x10-16, the clock frequency is measured against a hydrogen maser which is simultaneously calibrated to the US primary frequency standard, the NIST Cs fountain clock, NIST-F1. The comparison is made possible using a femtosecond laser based optical frequency comb to phase coherently connect the optical and microwave spectral regions and by a 3.5 km fiber transfer scheme to compare the remotely located clock signals.

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