12 September 2011 Time and frequency metrology at PTB: recent results
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At the Physikalisch-Technische Bundesanstalt (PTB), two caesium fountain primary frequency standards are used for International Atomic Time (TAI) contributions, for the realization of the time scale UTC(PTB), for frequency measurements of the Ytterbium 171Yb+ single-ion and the Strontium 87Sr lattice optical clocks, as well as for frequency calibration of experiments using Magnesium and Hydrogen atoms. With the help of opticallystabilized microwaves for the caesium fountain primary standards, a quantum projection noise limited operation of the fountain CSF1 was demonstrated. Atom loading using a slow atomic beam source was implemented in CSF2, which improves the fountain stability. The uncertainty of the CSF2 fountain is reduced due to a new evaluation of the distributed cavity phase shifts. The 171Yb+ ion offers two narrow optical transitions, both of which can be used as a frequency reference. The two transitions show different sensitivities to the variation of the fine structure constant, and such variations can be studied in the same atomic system. Frequency measurements of the 87Sr optical lattice clock were performed against the caesium fountain CSF1. They are in agreement with the values reported by other groups. Investigations of the blackbody radiation shift are in progress.
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Vladislav Gerginov, Vladislav Gerginov, } "Time and frequency metrology at PTB: recent results", Proc. SPIE 8132, Time and Frequency Metrology III, 81320H (12 September 2011); doi: 10.1117/12.892675; https://doi.org/10.1117/12.892675


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