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Accuracy evaluation of NIST-F1
The evaluation procedure of a new laser-cooled caesium fountain primary frequency standard developed at the National Institute of Standards and Technology (NIST) is described. The new standard,Expand
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First accuracy evaluation of NIST-F2
We report the first accuracy evaluation of NIST-F2, a second-generation laser-cooled caesium fountain primary standard developed at the National Institute of Standards and Technology (NIST) with aExpand
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Accuracy evaluation of ITCsF2: a nitrogen cooled caesium fountain
For almost two decades, caesium fountain primary frequency standards (PFS) have represented the best realization of the definition of the second in the International System of units. Their accuracyExpand
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Geodesy and metrology with a transportable optical clock
TLDR
An atomic clock has been deployed on a field measurement campaign to determine the height of a mountain location 1,000 m above sea level, returning a value that is in good agreement with state-of-the-art geodesy. Expand
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High-accuracy coherent optical frequency transfer over a doubled 642-km fiber link
To significantly improve the frequency references used in radio-astronomy and the precision measurements in atomic physics, we provide frequency dissemination through a 642-km coherent optical fiberExpand
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Frequency transfer via a two-way optical phase comparison on a multiplexed fiber network.
We performed a two-way remote optical phase comparison on optical fiber. Two optical frequency signals were launched in opposite directions in an optical fiber and their phases were simultaneouslyExpand
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Planar-waveguide external cavity laser stabilization for an optical link with 10-19 frequency stability
We stabilized the frequency of a compact planar-waveguide external cavity laser (ECL) on a Fabry-Perot cavity (FPC) through a Pound-Drever-Hall scheme. The residual frequency stability of the ECL isExpand
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LIFT-the Italian link for time and frequency
We report on the realization of the coherent optical link for time and frequency dissemination developed in Italy. The fiber backbone connects scientific laboratories that need accurate time andExpand
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High homogeneity solenoidal magnet for cesium frequency standard
In Cs frequency standards a zone of highly uniform magnetic flux density, lower in value of 0.1 T, is required. The magnetic homogeneity value is tied to the overall accuracy of the standard and, forExpand
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Virtues and problems of the high C-field Cs beam frequency standard
The high C-field Cs beam frequency standard is presently a working machine that is undergoing first evaluations. The projected 10/sup -14/ accuracy goal is as yet unattained, mainly because ofExpand
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