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Published on: September 5, 2017
Operational Magic Intensity for Sr Optical Lattice Clocks
Ichiro Ushijima1,2, Masao Takamoto1,3, Hidetoshi Katori1,2,3
1Quantum Metrology Laboratory, RIKEN, Wako, Saitama 351-0198, Japan.
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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