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

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

2009-01-23

arxiv.org/abs/0901.3654v1

Applied Physics Letters, 94, 141105 (2009)

Physics

Atomic Physics

3 pages, 3 figures

Scientific paper

10.1063/1.3112574

We demonstrate the use of a fiber-based femtosecond laser locked onto an ultra-stable optical cavity to generate a low-noise microwave reference signal. Comparison with both a liquid Helium cryogenic sapphire oscillator (CSO) and a Ti:Sapphire-based optical frequency comb system exhibit a stability about $3\times10^{-15}$ between 1 s 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 system is compared to the CSO and exhibits a stability of $3.5\times10^{-14}\tau^{-1/2}$. Our continuously operated fiber-based system therefore demonstrates its potential to replace the CSO for atomic clocks with high stability in both the optical and microwave domain, most particularly for operational primary frequency standards.

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