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Joyet, Alain

Nom
Joyet, Alain
Affiliation principale
Fonction
Post-doctorant
Identifiants
https://libra.unine.ch/handle/123456789/482

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  • Publication
    Accès libre
    First results with a cold cesium continuous fountain resonator
    (2001)
    Dudle, Gregor
    ;
    Joyet, Alain 
    ;
    Berthoud, Patrick
    ;
    Mileti, Gaetano 
    ;
    Thomann, Pierre 
    We report on the design, construction, and preliminary measurements on the resonator of a continuous Cs fountain frequency standard. The construction of the resonator is described, preliminary measurements of the available atomic flux, and of the beam temperature are presented, along with the first Ramsey fringes (width ≃1 Hz) obtained in this new type of fountain. We discuss theoretical aspects of the interrogation scheme with a special view on how aliasing or intermodulation effects are suppressed in a continuous fountain.
  • Publication
    Accès libre
    A continuous beam of slow, cold cesium atoms magnetically extracted from a 2D magneto-optical trap
    (1998)
    Berthoud, Patrick
    ;
    Joyet, Alain 
    ;
    Dudle, Gregor
    ;
    Sagna, N.
    ;
    Thomann, Pierre 
    Starting from a 2D magneto-optical trap where cesium atoms are permanently subjected to 3D sub-Doppler cooling and 2D magneto-optical trapping, we have produced a beam of cold atoms continuously extracted along the trap axis. The simplest extraction mechanism, presently used, is the drift velocity induced by a constant magnetic field. We have used this continuous beam of atoms to produce Ramsey fringes in a microwave cavity as a first demonstration of an atomic resonator operating continuously with laser cooled atoms. The shape of the resonance pattern allows an estimate of the axial temperature, typically 200 μK. The average velocity can be adjusted from 0.7 to 3 m/s; the trap-to-atomic-beam conversion efficiency is close to one.