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Person

Christophe Salomon

A man wearing glasses and a dark blazer over a blue striped shirt smiles softly against a neutral background.

French experimental physicist at the Paris Observatory's time-and-frequency laboratory who, with André Clairon, built the first working laser-cooled caesium fountain clock in 1991. Their machine demonstrated Ramsey interrogation times approaching a full second and became the prototype for every primary frequency standard now in operation around the world.

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