Hyperpolarizability effects in a Sr optical lattice clock

Details Hyperpolarizability effects in a Sr optical lattice clock Hyperpolarizability effects in a Sr optical lattice clock

2005-12-21

arxiv.org/abs/physics/0512201v1

Physics

Atomic Physics

Scientific paper

10.1103/PhysRevLett.96.103003

We report the observation of the higher order frequency shift due to the trapping field in a $^{87}$Sr optical lattice clock. We show that at the magic wavelength of the lattice, where the first order term cancels, the higher order shift will not constitute a limitation to the fractional accuracy of the clock at a level of $10^{-18}$. This result is achieved by operating the clock at very high trapping intensity up to $400 $kW/cm$^2$ and by a specific study of the effect of the two two-photon transitions near the magic wavelength.

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