Ultralow noise microwave generation with fiber-based optical frequency comb and application to atomic fountain clock

Millo, J.; Abgrall, M.; Lours, M.; English, E. M. L.; Jiang, H.; Guéna, J.; Clairon, A.; Tobar, M. E.; Bize, S.; Le Coq, Y.; Santarelli, G.
April 2009
Applied Physics Letters;4/6/2009, Vol. 94 Issue 14, p141105
Academic Journal
We demonstrate the use of a fiber-based femtosecond laser locked onto an ultrastable optical cavity to generate a low-noise microwave reference signal. Comparison with both a cryogenic sapphire oscillator (CSO) and a titanium-sapphire-based optical frequency comb system exhibit a stability of about 3×10-15 between 1 and 10 s. The microwave signal from the fiber system is used to perform Ramsey spectroscopy in a state-of-the-art cesium fountain clock. The resulting clock is compared to the CSO and exhibits a stability of 3.5×10-14τ-1/2.


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