aqora

Principle and Progress of Cold Atom Clock in Space

屈求智 Qu Qiuzhi, 汪斌 Wang Bin, 吕德胜 Lü Desheng +4 more

Chinese Journal of LasersJan 1, 20153 citations

Frequency measurements of cold-atom clocks

Scott A. Diddams

APSApr 1, 20011 citation

Metrological features of the rubidium two-photon standards of the BNM-LPTF and Kastler Brossel Laboratories

Laurent Hilico, R. Felder, Driss Touahri +3 more

We have built three optical frequency standards based on the two-photon transition of rubidium at 778 nm, and analysed their performance over a period of more than three years. We discuss some systematic effects that could lead to the reproducibility we observe, and point out the possible improvements of the devices. We also examine the short and long term stabilities of the systems, and show that we have reached their ultimate performances.

The European Physical Journal Applied PhysicsNov 1, 199844 citations

Atomic Clocks and Cold Atom Scattering

Chad Fertig, Ronald Legere, J.Irfon Rees +3 more

Springer eBooksJan 1, 20031 citation

Advances in 133Cs Fountains: Control of the Cold Collision Shift and Observation of Feshbach Resonances

S. Bize

This paper describes the work performed at BNM‐SYRTE (Observatoire de Paris) over the past few years toward the improvement and the use of microwave frequency standards using laser‐cooled atoms. First, recent improvements of the 133Cs and 87Rb atomic fountains are described. An important advance is the achievement of a fractional frequency instability of 1.6 × 10−14τ−1/2 where τ is the measurement time in seconds, thanks to the routine use of a cryogenic sapphire oscillator as an ultra‐stable local frequency reference. The second advance is a powerful method to control the frequency shift due to cold collisions. These two advances lead to a frequency stability of 2 × 10−16 at 50 000 s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of 7 × 10−16, one order of magnitude below that of uncooled devices.This paper describes the work performed at BNM‐SYRTE (Observatoire de Paris) over the past few years toward the improvement and the use of microwave frequency standards using laser‐cooled atoms. First, recent improvements of the 133Cs and 87Rb atomic fountains are described. An important advance is the achievement of a fractional frequency instability of 1.6 × 10−14τ−1/2 where τ is the measurement time in seconds, thanks to the routine use of a cryogenic sapphire oscillator as an ultra‐stable local frequency reference. The second advance is a powerful method to control the frequency shift due to cold collisions. These two advances lead to a frequency stability of 2 × 10−16 at 50 000 s for the first time for primary standards. In addition, these clocks realize the SI second with an accuracy of 7 × 10−16, one order of magnitude below that of uncooled devices.

AIP conference proceedingsJan 1, 20051 citation

Cold atom space clock with counter-propagating atoms

吕德胜, 汪斌, 李唐 +1 more

Chinese Optics LettersJan 1, 20100 citations

Recent progress on the cold atoms clocks at BNM-LPTF

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