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Hyperpolarizability effects in a Sr optical lattice clock

Anders Brusch·Rodolphe Le Targat·Xavier Baillard·Mathilde Fouché·Pierre Lemonde
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Abstract

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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Anders Brusch, Rodolphe Le Targat, Xavier Baillard, Mathilde Fouché, Pierre Lemonde. 2005-12-21. Hyperpolarizability effects in a Sr optical lattice clock. https://doi.org/10.1103/physrevlett.96.103003

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