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- W2067744487 endingPage "843" @default.
- W2067744487 startingPage "789" @default.
- W2067744487 abstract "Recent years have brought major breakthroughs in the development, operation and mutual comparison of frequency standards in the microwave as well as in the optical frequency domain. Several cold-atom fountains have been developed, using caesium as well as rubidium atoms. Some of them have been compared among each other. Mutual agreement of the order of one part in 1015 was demonstrated for two caesium fountains operated side by side but also for two operated simultaneously in the US and Germany. Ultra-narrow resonances of optical transition lines were observed using single trapped ions, and a maximum line quality factor in excess of 1014 was reported. Measurements of frequencies in the optical range of atomic transitions in neutral hydrogen and calcium, as well as in ions of indium, mercury, strontium and ytterbium, were performed. The last-named achievements were to a large extent enabled by the use of Kerr-effect mode-locked Ti:sapphire femtosecond lasers and techniques of broadening the output spectrum of these lasers to an octave-wide comb." @default.
- W2067744487 created "2016-06-24" @default.
- W2067744487 creator A5059518283 @default.
- W2067744487 creator A5085881868 @default.
- W2067744487 date "2002-04-15" @default.
- W2067744487 modified "2023-09-26" @default.
- W2067744487 title "Frequency standards and frequency measurement" @default.
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