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

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...

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Bibliographic Details
Published in:IEEE transactions on ultrasonics, ferroelectrics, and frequency control ferroelectrics, and frequency control, 2016-08, Vol.63 (8), p.1198-1203
Main Authors: Abgrall, M., Guena, J., Lours, M., Santarelli, G., Tobar, M. E., Bize, S., Grop, S., Dubois, B., Fluhr, C., Giordano, V.
Format: Article
Language:English
Subjects:
Accuracy
Atomic clocks
atomic fountains
Clocks
Ferroelectric materials
Forecasting
Frequency measurement
Frequency standards
Instrumentation and Detectors
Interrogation
Laser stability
Noise
Noise measurement
Oscillators
Phase measurement
Phase noise
Physics
stability analysis
Synthesizers
ultrastable oscillators
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Summary: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.
ISSN:0885-3010
1525-8955
DOI:10.1109/TUFFC.2016.2570898