Optical Lattice Induced Light Shifts in a Yb Atomic Clock
We present an experimental study of the lattice-induced light shifts on the S01→P03 optical clock transition (νclock≈518 THz) in neutral ytterbium. The “magic” frequency νmagic for the Yb174 isotope was determined to be 394 799 475(35) MHz, which leads to a first order light shift uncertainty of 0.38 Hz. We also investigated the hyperpolarizability shifts due to the nearby 6s6pP03→6s8pP03, 6s8pP23, and 6s5fF23 two-photon resonances at 759.708, 754.23, and 764.95 nm, respectively. By measuring the corresponding clock transition shifts near these two-photon resonances, the hyperpolarizability shift was estimated to be 170(33) mHz for a linear polarized, 50 μK deep, lattice at the magic wavelength. These results indicate that the differential polarizability and hyperpolarizability frequency shift uncertainties in a Yb lattice clock could be held to well below 10−17.
Barber, Z. W., J. E. Stalnaker, N. D. Lemke, C. W. Oates, et al. 2008. "Optical Lattice Induced Light Shifts in a Yb Atomic Clock." Physical Review Letters 100.
American Physical Society
Physical Review Letters
Physics and Astronomy