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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
    Accès libre
    Long-Term Stability Analysis Towards <10-14 Level for a Highly Compact POP Rb Cell Atomic Clock
    Almat, Nil 
    ;
    Gharavipour, Mohammadreza 
    ;
    Moreno, William 
    ;
    Gruet, Florian 
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    Long-term frequency instabilities in vapor-cell clocks mainly arise from fluctuations of the experimental and environmental parameters that are converted to clock frequency fluctuations via various physical processes. Here, we discuss the frequency sensitivities and the resulting stability limitations at one-day timescale for a rubidium vapor-cell clock based on a compact magnetron-type cavity operated in air (no vacuum environment). Under ambient laboratory conditions, the external atmospheric pressure fluctuations may dominantly limit the clock stability via the barometric effect. We establish a complete longterm instability budget for our clock operated under stable pressure conditions. Where possible, the fluctuations of experimental parameters are measured via the atomic response. The measured clock instability of <2 × 10-14 at one day is limited by the intensity light-shift effect, which could further be reduced by active stabilization of the laser intensity or stronger optical pumping. The analyses reported here show the way toward simple, compact, and low-power vapor-cell atomic clocks with excellent long-term stabilities ≤10-14 at one day when operated in ambient laboratory conditions.
  • Publication
    Accès libre
    Optically-detected spin-echo method for relaxation times measurements in a Rb atomic vapor
    Gharavipour, Mohammadreza 
    ;
    Affolderbach, Christoph 
    ;
    Gruet, Florian 
    ;
    Radojičić, I. S
    ;
    Krmpot, A. J
    ;
    Jelenković, B. M
    ;
    Mileti, Gaetano 
    We introduce and demonstrate an experimental method, optically-detected spin-echo (ODSE), to measure ground-state relaxation times of a rubidium (Rb) atomic vapor held in a glass cell with buffer-gas. The work is motivated by our studies on high-performance Rb atomic clocks, where both population and coherence relaxation times ( T1 and T2 , respectively ) of the ‘ clock transition ’ (52 S1/2 ∣ Fg = 1, mF = 0⟩ ↔ ∣ Fg = 2, mF = 0⟩) are relevant. Our ODSE method is inspired by classical nuclear magnetic resonance spin-echo method, combined with optical detection. In contrast to other existing methods, like continuous-wave double-resonance ( CW-DR ) and Ramsey-DR, principles of the ODSE method allow suppression of decoherence arising from the inhomogeneity of the static magnetic field across the vapor cell, thus enabling measurements of intrinsic relaxation rates, as properties of the cell alone. Our experimental result for the coherence relaxation time, specific for the clock transition, measured with the ODSE method is in good agreement with the theoretical prediction, and the ODSE results are validated by comparison to those obtained with Franzen, CW-DR and Ramsey-DR methods. The method is of interest for a wide variety of quantum optics experiments with optical signal readout.