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arXiv · 1812.11815

Operational Magic Intensity for Sr Optical Lattice Clocks

Ichiro Ushijima·Masao Takamoto·Hidetoshi Katori
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Abstract

We experimentally investigate the lattice-induced light shift by the electric-quadrupole ($E2$) and magnetic-dipole ($M1$) polarizabilities and the hyperpolarizability in Sr optical lattice clocks. Precise control of the axial as well as the radial motion of atoms in a one-dimensional lattice allows observing the $E2$-$M1$ polarizability difference. Measured polarizabilities determine an operational lattice depth to be $72(2) E_R$, where the total light shift cancels to the $10^{-19}$ level, over a lattice-intensity variation of about 30%. This operational trap depth and its allowable intensity range conveniently coincide with experimentally feasible operating conditions for Sr optical lattice clocks.

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Ichiro Ushijima, Masao Takamoto, Hidetoshi Katori. 2018-12-31. Operational Magic Intensity for Sr Optical Lattice Clocks. https://doi.org/10.1103/physrevlett.121.263202

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