Demonstration of a dual alkali Rb/Cs fountain clock

Guéna, Jocelyne; Rosenbusch, P.; Laurent, P.; Abgrall, M.; Rovera, Daniele; Santarelli, G.; Tobar, Michael E.; Bize, S.; Clairon, A.

doi:10.1109/tuffc.2010.1461

Cited by 65 publications

(79 citation statements)

References 20 publications

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“…This synthesizer is described in detail in [27]. Figure 5 (upper section, red) highlights the main features.…”

Section: B Fo2-rb Microwave Synthesizermentioning

confidence: 99%

“…A dichroic plate in these collimators combines the light at 780 nm with the light at 852 nm for the caesium part of the fountain [27]. The molasses beam diameter (at 1/e 2 ) is 26 mm.…”

Section: Introductionmentioning

confidence: 99%

“…The transition probability from the |F = 1, m F = 0 clock state to |F = 2, m F = 0 is alternately measured at the two sides of the central Ramsey fringe (full width at half maximum 0.82 Hz, contrast > 99.5%) to lock the interrogation microwave signal to the clock transition at 6.8 GHz. Further details about the FO2 fountain setup can be found in [27], [33]- [37]. A key factor to achieve low fractional frequency instability is the noise level of the atomic detection.…”

Section: Introductionmentioning

confidence: 99%

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Contributing to TAI with a secondary representation of the SI second

et al. 2014

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Abstract-We report the first contribution to the international atomic time (TAI) based on a secondary representation of the SI second. This work is done with the LNE-SYRTE FO2-Rb fountain frequency standard using the 87 Rb ground state hyperfine transition. We describe FO2-Rb and how it is connected to local and international time scales. We report on local measurements of this frequency standard in the SI system, i.e. against primary frequency standards, down to a fractional uncertainty of 4.4 × 10 −16 , and on the establishment of the recommended value for the 87 Rb hyperfine transition by the CIPM. We also report on the process that led to the participation of the FO2-Rb frequency standard to Circular T and to the elaboration of TAI. This participation enables us to demonstrate absolute frequency measurement directly in terms of the SI second realized by the TAI ensemble with a statistical uncertainty of 1.1 × 10 −16 , therefore at the limit allowed by the accuracy of primary frequency standards. This work constitutes a demonstration of how other secondary representations, based on optical transitions, could also be used for TAI, and an investigation of a number of issues relevant to a future redefinition of the SI second.

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“…This synthesizer is described in detail in [27]. Figure 5 (upper section, red) highlights the main features.…”

Section: B Fo2-rb Microwave Synthesizermentioning

confidence: 99%

“…A dichroic plate in these collimators combines the light at 780 nm with the light at 852 nm for the caesium part of the fountain [27]. The molasses beam diameter (at 1/e 2 ) is 26 mm.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contributing to TAI with a secondary representation of the SI second

et al. 2014

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“…The blue line shows the performance of the Aluminum ion clock [21]. The solid red line shows the performance of a Cesium fountain run in high accuracy mode during a Rubidium vs Cesium comparison [23]. The light red arrow shows the current accuracy of many of the world's best Cesium fountains.…”

Section: New Results From a Cryogenic Cs Fountain Clock At The Nationmentioning

confidence: 99%

Building a better atomic clock

Bloom¹

2013

Phys. Today

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DateThe final copy of this thesis has been examined by the signatories, and we find that both the content and the form meet acceptable presentation standards of scholarly work in the above mentioned discipline. this work documents the first optical lattice clock to best all other atomic clock implementations, a mere 8 years after the first proof of principle experiments. In this thesis I will describe how we have overcome a number of important systematic uncertainties to achieve these results. This revolution in accuracy and precision opens the door for new experiments utilizing the clock as a probe of quantum many-body physics. To this end, a new apparatus has been designed that combines the unprecedented precision of clock experiments with the amazing progress attained in quantum gas experiments. DedicationTo my family, both old and new.

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“…Bien qu'un maser à hydrogène de bonne qualité, comme ceux dont nous disposons, soit relativement stable et prédictible, nous tirons parti de l'ensemble de fontaines atomiques, étalons primaires et secondaires de fré-quence [4][5][6][7][8] développés au LNE-SYRTE, pour estimer avec exactitude la fréquence du maser à hydrogène utilisé pour réaliser UTC(OP). Le premier bloc de l'algorithme constitue une boucle ouverte du type feed-forward.…”

Section: Premier Bloc : Algorithme De Stabilitéunclassified