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Batori, Etienne

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Batori, Etienne
Affiliation principale
Fonction
Ancien.ne collaborateur.trice
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https://libra.unine.ch/handle/123456789/32179
_
0000-0003-0816-9380

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  • Publication
    Accès libre
    A cold-atom Ramsey clock with a low volume physics package
    (2024-01-09)
    Alan Bregazzi
    ;
    Batori, Etienne 
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    ;
    Paul Griffin
    ;
    Ben Lewis
    ;
    Erling Riis
    We demonstrate a Ramsey-type microwave clock interrogating the 6.835~GHz ground-state transition in cold \textsuperscript{87}Rb atoms loaded from a grating magneto-optical trap (GMOT) enclosed in an additively manufactured loop-gap resonator microwave cavity. A short-term stability of 1.5×10−11~τ−1/2 is demonstrated, in reasonable agreement with predictions from the signal-to-noise ratio of the measured Ramsey fringes. The cavity-grating package has a volume of ≈67~cm\textsuperscript{3}, ensuring an inherently compact system while the use of a GMOT drastically simplifies the optical requirements for laser cooled atoms. This work is another step towards the realisation of highly compact portable cold-atom frequency standards.
  • Publication
    Accès libre
    An additive-manufactured microwave cavity for a compact cold-atom clock
    (2023)
    Batori, Etienne 
    ;
    Alan Bregazzi
    ;
    Ben Lewis
    ;
    Paul F. Griffin
    ;
    Erling Riis
    ;
    Mileti, Gaetano 
    ;
    Affolderbach, Christoph 
    We present an additive-manufactured microwave cavity for a Ramsey-type, double resonance, compact cold-atom clock. Atoms can be laser cooled inside the cavity using a grating magneto-optic trap with the cavity providing an excellent TE011-like mode while maintaining sufficient optical access for atomic detection. The cavity features a low Q-factor of 360 which conveniently reduces the cavity pulling of the future clock. Despite the potential porosity of the additive-manufacturing process, we demonstrate that the cavity is well-suited for vacuum. A preliminary clock setup using cold atoms allows for measuring the Zeeman spectrum and Rabi oscillations in the cavity which enables us to infer excellent field uniformity and homogeneity, respectively, across the volume accessed by the cold atoms. Ramsey spectroscopy is demonstrated, indicating that the cavity is suitable for clock applications. Finally, we discuss the limitations of the future clock.
  • Publication
    Accès libre
    GNSS-grade space atomic frequency standards: Current status and ongoing developments
    (2021)
    Batori, Etienne 
    ;
    Almat, Nil 
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    We present an overview on the current state of Global Navigation Satellite Systems (GNSS)-grade or better space atomic frequency standards’ (SAFS) technologies and discuss their applications. We estimate that a total of more than 1000 such standards were sent to space so far, the vast majority consisting of rubidium-cell frequency standards, Cs atomic beam frequency standards, and passive hydrogen masers. Finally, we review a variety of ongoing developments in view of future new generations of GNSS-grade SAFSs.