Improved Absolute Frequency Measurement of the 171Yb Optical Lattice Clock at KRISS Relative to the SI Second

Abstract

We measured the absolute frequency of the ${}^1{S}_0$ - ${}^3{P}_0$ transition of ${}^{171}$Yb atoms confined in a one-dimensional optical lattice relative to the SI second. The determined frequency was 518 295 836 590 863.38(57) Hz. The uncertainty was reduced by a factor of 14 compared with our previously reported value in 2013 due to the significant improvements in decreasing the systematic uncertainties. This result is expected to contribute to the determination of a new recommended value for the secondary representations of the second.

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• Faraday-shielded, DC Stark-free optical lattice clock
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• Relativistic full-configuration-interaction calculations of magic wavelengths for the $2{}^3{S}_1\to 2{}^1{S}_0$ transition of helium isotopes
• Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain
• Advanced Satellite-based Frequency Transfer at the 10^{-16} Level
• Evaluation of the relativistic redshift in frequency standards at KRISS
• Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit
• Robust frequency stabilization and linewidth narrowing of a laser with large intermittent frequency jumps using an optical cavity and an atomic beam
• Improved absolute frequency measurement of ${}^{171}$Yb at NMIJ with uncertainty below $2\times 10^{-16}$