High-Stability Comparison of Atomic Fountains Using Two Different Cryogenic Oscillators

M. Abgrall, J. Guena, M. Lours, G. Santarelli, Michael E. Tobar, S. Bize, S. Grop, B. Dubois, C. Fluhr, V. Giordano

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)


    © 2016 IEEE.We present a detailed characterization of two atomic clock interrogation systems based on two different cryogenic sapphire oscillators operated simultaneously. We use them as references for two accurate fountain clock frequency standards participating in international atomic time and operating both at the quantum projection noise frequency limit. The two fountain comparison down to a few $10^{-16}$ over 28 days demonstrates the potential of a cryocooled oscillator to replace a He-refilled cryogenic oscillator.
    Original languageEnglish
    Article number7473893
    Pages (from-to)1198-1203
    Number of pages6
    JournalIEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    Issue number8
    Publication statusPublished - Aug 2016


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