Description
Talks on state-of-the-art precision in measurements, universal time and other application of very precise clocks.
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Prof. Jim Bergquist (NIST Boulder, USA)27/08/2007, 11:00In recent years, several groups throughout the world have initiated research toward the development and systematic evaluation of frequency and time standards based on narrow optical transitions in laser-cooled atomic systems. In this report we present some of the results obtained in comparative studies of the Hg+ single ion optical clock, the Al+ single ion optical clock and the Cs fountain...Go to contribution page
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Prof. Ekkehard Peik (PTB Braunschweig, Germany)27/08/2007, 11:45The techniques of trapping and laser cooling of ions have allowed to perform laser spectroscopy of forbidden transitions with a resolution of a few hertz. These systems will be used as optical atomic clocks that offer higher stability and greater accuracy than the best primary cesium clocks available today. At PTB we have built an optical clock based on a single trapped ytterbium ion and...Go to contribution page
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Prof. Cristophe Salomon (Kastler Brossel, Paris, France)27/08/2007, 14:30We will describe the present status for the realization of the SI unit of time, the second. Microwave frequency standards operating with laser cooled cesium and rubidium atoms have advanced by two orders of magnitude in the last two decades. Cesium fountains currently operate at the fundamental quantum noise limit with 107 detected atoms and display a relative frequency stability of...Go to contribution page