4.4 Article

Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain

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METROLOGIA
卷 60, 期 3, 页码 -

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IOP Publishing Ltd
DOI: 10.1088/1681-7575/accbc5

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frequency metrology; optical lattice clock; Cs fountain; SI second

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We present a new absolute frequency measurement of ytterbium (Yb-171) using a hydrogen maser or an optical frequency comb, against a cryogenic caesium fountain. The frequency of the Yb-171 unperturbed clock transition is 518 295 836 590 863.44(14) Hz, with a total fractional uncertainty of 2.7x10(-16), consistent with the recommended Yb frequency.
We present the new absolute frequency measurement of ytterbium (Yb-171) obtained at INRiM with the optical lattice clock IT-Yb1 against the cryogenic caesium (Cs-133) fountain IT-CsF2, evaluated through a measurement campaign that lasted 14 months. Measurements are performed by either using a hydrogen maser as a transfer oscillator or by synthesizing a low-noise microwave for Cs interrogation using an optical frequency comb. The frequency of the Yb-171 unperturbed clock transition S-1(0)-> P-3(0) results to be 518 295 836 590 863.44(14) Hz, with a total fractional uncertainty of 2.7x10(-16) that is limited by the uncertainty of IT-CsF2. Our measurement is in agreement with the Yb frequency recommended by the Consultative Committee for Time and Frequency. This result confirms the reliability of Yb as a secondary representation of the second and is relevant to the process of redefining the second in the International System of Units on an optical transition.

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