期刊
METROLOGIA
卷 54, 期 1, 页码 102-112出版社
IOP PUBLISHING LTD
DOI: 10.1088/1681-7575/aa4e62
关键词
optical lattice clock; SI second; frequency metrology
资金
- European Metrology Research Program (EMRP) Project [SIB55-ITOC]
- Regione Piemonte YTRO Project
- European Union [263500]
- Italian Ministry of Education, University and Research
- Innovative Training Network (ITN) Future Atomic Clock Technology (FACT)
- European Metrology Program for Innovation and Research (EMPIR) project [15SIB03 OC18]
- EMRP within EURAMET
- European Union
- EMPIR programm
We report the absolute frequency measurement of the unperturbed transition S-1(0) - P-3(0) at 578 nm in Yb-171 realized in an optical lattice frequency standard relative to a cryogenic caesium fountain. The measurement result is 518 295 836 590 863.59(31) Hz with a relative standard uncertainty of 5.9x10(-16). This value is in agreement with the ytterbium frequency recommended as a secondary representation of the second in the International System of Units.
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