Microwave Frequencies Metrology

The group metrology at microwave frequencies at SYRTE, Observatoire de Paris, is developing cesium and rubidium atomic clocks following three main orientations:

• cold atom fountain clocks contributing to the definition of the second of the international system of units and to the generation of national and international time references;
• compact atomic clocks, for industrial and space applications;
• participation to the ACES/PHARAO space mission, including the cold atom clock PHARAO.

ACES: Atomic Clock Ensemble in Space.
PHARAO: Projet d’Horloge A Refroidissement d’Atomes en Orbite.