Abstract
We experimentally investigate an optical clock based on () atoms confined in an optical lattice. We have evaluated all known frequency shifts to the clock transition, including a density-dependent collision shift, with a fractional uncertainty of , limited principally by uncertainty in the blackbody radiation Stark shift. We measured the absolute clock transition frequency relative to the NIST-F1 Cs fountain clock and find the frequency to be 518 295 836 590 865.2(0.7) Hz.
- Received 23 March 2009
DOI:https://doi.org/10.1103/PhysRevLett.103.063001
Synopsis
Atoms in a lattice keep time
Published 3 August 2009
An optical-lattice clock based on atoms with spin- nuclei could potentially challenge the current clock standard.
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