Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms

Abstract

We have developed an optical lattice clock that can operate in dual modes: a strontium (Sr) clock mode and an ytterbium (Yb) clock mode. Dual-mode operation of the Sr-Yb optical lattice clock is achieved by alternately cooling and trapping ${}^{87}$Sr and ${}^{171}$Yb atoms inside the vacuum chamber of the clock. Optical lattices for Sr and Yb atoms were arranged with horizontal and vertical configurations, respectively, resulting in a small distance of the order of 100 $\mu$m between the trapped Sr and Yb atoms. The ${}^1$S${}_0$-${}^3$P${}_0$ clock transitions in the trapped atoms were interrogated in turn and the clock lasers were stabilized to the transitions. We demonstrated the frequency ratio measurement of the Sr and Yb clock transitions by using the dual-mode operation of the Sr-Yb optical lattice clock. The dual-mode operation can reduce the uncertainty of the blackbody radiation shift in the frequency ratio measurement, because both Sr and Yb atoms share the same blackbody radiation.

arXiv comment6 pages,5 figures

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Cited by in corpus (7)

• Absolute frequency measurement of the 171Yb optical lattice clock at KRISS using TAI for over a year
• Demonstration of the nearly continuous operation of an ${}^{171}$Yb optical lattice clock for half a year
• Uncertainty evaluation of an ${}^{171}$Yb optical lattice clock at NMIJ
• Observation of an Inner-Shell Orbital Clock Transition in Neutral Ytterbium Atoms
• Improved Frequency Ratio Measurement with 87Sr and 171Yb Optical Lattice Clocks at NMIJ
• Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit
• Decoherence of Atomic Ensembles in Optical Lattice Clocks by Gravity