Absolute frequency measurement of the 88Sr+ clock transition using a GPS link to the SI second

From National Research Council Canada

DOIResolve DOI: https://doi.org/10.1088/1681-7575/aa5e60
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Name affiliation
  1. National Research Council of Canada. Measurement Science and Standards
FormatText, Article
Journal titleMetrologia
ISSN0026-1394
1681-7575
Volume54
Issue3
Pages290–298
Subjectabsolute frequency measurement; single-ion clock; optical atomic clock; high-resolution spectroscopy
Abstract
We report the results of a recent measurement of the absolute frequency of the 5s2 S1/2 – 4d2 D5/2 transition of the 88Sr + ion. The optical frequency was measured against the international atomic time realization of the SI second on the geoid as obtained by frequency transfer using a global positioning system link and the precise point positioning technique. The measurement campaign yielded more than 100 h of frequency data. It was performed with improvements to the stability and accuracy of the single-ion clock compared to the last measurement made in 2012. The single ion clock uncertainty is evaluated at 1.5 x 10(-17) when contributions from acousto-optic modulator frequency chirps and servo errors are taken into account. The stability of the ion clock is 3 x 10(-15) at 1 s averaging, a factor of three better than in the previous measurement. The results from the two measurement campaigns are in good agreement. The uncertainty of the measurement, primarily from the link to the SI second, is 0.75 Hz (1.7 x 10(-15)). The frequency measured for the S–D clock transition of 88Sr + is Vo = 444779044095485.27(75)Hz.
Publication date
PublisherIOP
LanguageEnglish
Peer reviewedYes
NPARC number23002322
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