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physics.atom-ph2008★ 151 cited
The absolute frequency of the 87Sr optical clock transition
Gretchen K. Campbell, Andrew D. Ludlow, Sebastian Blatt +10
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…
physics.atom-ph2007★ 140 cited
Coherent optical phase transfer over a 32-km fiber with 1-s instability at
Seth M. Foreman, Andrew D. Ludlow, Marcio H. G. de Miranda +3
The phase coherence of an ultrastable optical frequency reference is fully maintained over actively stabilized fiber networks of lengths exceeding 30 km. For a 7-km link installed…