Imaging Optical Frequencies with 100  μHz Precision and 1.1  μm Resolution.

@article{Marti2018ImagingOF,
  title={Imaging Optical Frequencies with 100  $\mu$Hz Precision and 1.1  $\mu$m Resolution.},
  author={G. Edward Marti and R. B. Hutson and A. Goban and S. L. Campbell and Nicola Poli and Jun Ye},
  journal={Physical review letters},
  year={2018},
  volume={120 10},
  pages={
          103201
        }
}
We implement imaging spectroscopy of the optical clock transition of lattice-trapped degenerate fermionic Sr in the Mott-insulating regime, combining micron spatial resolution with submillihertz spectral precision. We use these tools to demonstrate atomic coherence for up to 15 s on the clock transition and reach a record frequency precision of 2.5×10^{-19}. We perform the most rapid evaluation of trapping light shifts and record a 150 mHz linewidth, the narrowest Rabi line shape observed on a… 

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