Hyperpolarizability and Operational Magic Wavelength in an Optical Lattice Clock

R. C. Brown, N. B. Phillips, K. Beloy, W. F. McGrew, M. Schioppo, R. J. Fasano, G. Milani, X. Zhang, N. Hinkley, H. Leopardi, Tai Hyun Yoon, D. Nicolodi, T. M. Fortier, A. D. Ludlow

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Optical clocks benefit from tight atomic confinement enabling extended interrogation times as well as Doppler- and recoil-free operation. However, these benefits come at the cost of frequency shifts that, if not properly controlled, may degrade clock accuracy. Numerous theoretical studies have predicted optical lattice clock frequency shifts that scale nonlinearly with trap depth. To experimentally observe and constrain these shifts in an Yb171 optical lattice clock, we construct a lattice enhancement cavity that exaggerates the light shifts. We observe an atomic temperature that is proportional to the optical trap depth, fundamentally altering the scaling of trap-induced light shifts and simplifying their parametrization. We identify an "operational" magic wavelength where frequency shifts are insensitive to changes in trap depth. These measurements and scaling analysis constitute an essential systematic characterization for clock operation at the 10-18 level and beyond.

Original languageEnglish
Article number253001
JournalPhysical Review Letters
Volume119
Issue number25
DOIs
Publication statusPublished - 2017 Dec 19

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Brown, R. C., Phillips, N. B., Beloy, K., McGrew, W. F., Schioppo, M., Fasano, R. J., Milani, G., Zhang, X., Hinkley, N., Leopardi, H., Yoon, T. H., Nicolodi, D., Fortier, T. M., & Ludlow, A. D. (2017). Hyperpolarizability and Operational Magic Wavelength in an Optical Lattice Clock. Physical Review Letters, 119(25), [253001]. https://doi.org/10.1103/PhysRevLett.119.253001