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Gruet, Florian

Nom
Gruet, Florian
Affiliation principale
Site web
Fonction
Ingénieur
Email
florian.gruet@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/487

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  • Publication
    Métadonnées seulement
    High performance vapour-cell frequency standards
    (: Journal of Physics: Conference Series 723, 2015-10-27)
    Gharavipour, Mohammadreza 
    ;
    Affolderbach, Christoph 
    ;
    Kang, Songbai 
    ;
    Bandi Nagabhushan, Thejesh 
    ;
    Gruet, Florian 
    ;
    Pellaton, Matthieu 
    ;
    Mileti, Gaetano 
    We report our investigations on a compact high-performance rubidium (Rb) vapour-cell clock based on microwave-optical double-resonance (DR). These studies are done in both DR continuous-wave (CW) and Ramsey schemes using the same Physics Package (PP), with the same Rb vapour cell and a magnetron-type cavity with only 45 cm3 external volume. In the CW-DR scheme, we demonstrate a DR signal with a contrast of 26% and a linewidth of 334 Hz; in Ramsey-DR mode Ramsey signals with higher contrast up to 35% and a linewidth of 160 Hz have been demonstrated. Short-term stabilities of 1.4Ă—10^-13 Ď„^-1/2 and 2.4Ă—10^-13 Ď„^-1/2 are measured for CW-DR and Ramsey-DR schemes, respectively. In the Ramsey-DR operation, thanks to the separation of light and microwave interactions in time, the light-shift effect has been suppressed which allows improving the long-term clock stability as compared to CW-DR operation. Implementations in miniature atomic clocks are considered.
  • Publication
    Accès libre
    Evaluation of the frequency stability of a VCSEL locked to a micro-fabricated Rubidium vapour cell
    (2010)
    Di Francesco, Joab F.
    ;
    Gruet, Florian 
    ;
    Schori, Christian 
    ;
    Affolderbach, Christoph 
    ;
    Matthey-De-L'Endroit, Renaud 
    ;
    Mileti, Gaetano 
    ;
    Salvadé, Y.
    ;
    de Rooij, Nicolaas F.
    ;
    Petremand, Y.
    We present our evaluation of a compact laser system made of a 795 nm VCSEL locked to the Rubidium absorption line of a micro-fabricated absorption cell. The spectrum of the VCSEL was characterised, including its RIN, FM noise and line-width. We optimised the signal-to-noise ratio and determined the frequency shifts versus the cell temperature and the incident optical power. The frequency stability of the laser (Allan deviation) was measured using a high-resolution wavemeter and an ECDL-based reference. Our results show that a fractional instability of ≥ 10-9 may be reached at any timescale between 1 and 100'000 s. The MEMS cell was realised by dispensing the Rubidium in a glass-Silicon preform which was then, sealed by anodic bonding. The overall thickness of the reference cell is 1.5 mm. No buffer gas was added. The potential applications of this compact and low-consumption system range from optical interferometers to basic laser spectroscopy. It is particularly attractive for mobile and space instruments where stable and accurate wavelength references are needed.