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.

Absolute frequency measurement of a Yb optical clock at the limit of the Cs fountain / Goti, Irene; Condio, Stefano; Clivati, Cecilia; Risaro, Matias; Gozzelino, Michele; A Costanzo, Giovanni; Levi, Filippo; Calonico, Davide; Pizzocaro, Marco. - In: METROLOGIA. - ISSN 0026-1394. - 60:3(2023), p. 035002. [10.1088/1681-7575/accbc5]

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

Irene Goti;Stefano Condio;Cecilia Clivati;Matias Risaro;Michele Gozzelino;Filippo Levi;Davide Calonico;Marco Pizzocaro
2023

Abstract

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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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/77939
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