Precision spectroscopy and density-dependent frequency shifts in ultracold Sr
Tetsuya Ido, Thomas H. Loftus, Martin M. Boyd, Andrew D. Ludlow, Kevin W. Holman, Jun Ye
Abstract
By varying the density of an ultracold 88Sr sample from 109 cm-3 to > 1012 cm-3, we make the first definitive measurement of the density-related frequency shift and linewidth broadening of the 1S0 - 3P1 optical clock transition in an alkaline earth system. In addition, we report the most accurate measurement to date of the 88Sr 1S0 - 3P1 optical clock transition frequency. Including a detailed analysis of systematic errors, the frequency is (434 829 121 312 334 20stat 33sys) Hz.
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