Authors
A. Yamaguchi, M. S. Safronova, K. Gibble, and H. Katori
Abstract
We experimentally and theoretically determine the magic wavelength of the (5s2)1S0−(5s5p)3P0 clock transition of 111Cd to be 419.88(14) and 420.1(7) nm. To perform Lamb-Dicke spectroscopy of the clock transition, we use narrow-line laser cooling on the 1S0−3P1 transition to cool the atoms to 6 μK and load them into an optical lattice. Cadmium is an attractive candidate for optical lattice clocks because it has a small sensitivity to blackbody radiation and its efficient narrow-line cooling mitigates higher order light shifts. We calculate the blackbody shift, including the dynamic correction, to be fractionally 2.83(8)×10−16 at 300 K, an order of magnitude smaller than that of Sr and Yb. We also report calculations of the Cd 1P1 lifetime and the ground state C6 coefficient.
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Physical Review Letters : https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.123.113201