Press Releases

2019.01.18

Operational Magic Intensity for Sr Optical Lattice Clocks:Assistant Professor Ichiro Ushijima, Professor Hidetoshi Katori, Department of Applied Physics, and other researchers.

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)ER, where the total light shift cancels to the 1019 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.

 

 

Physical Review Letters : https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.121.263202