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Thomann, Pierre

Nom
Thomann, Pierre
Affiliation principale
Fonction
Professeur honoraire
Email
pierre.thomann@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/481

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  • Publication
    Métadonnées seulement
    Pump-probe spectroscopy and velocimetry of cold atoms in a slow beam
    (2001)
    Di Domenico, Gianni 
    ;
    Mileti, Gaetano 
    ;
    Thomann, Pierre 
    In this paper we report on the first purely "pump-probe" nonlinear laser spectroscopy results in a slow atomic beam. We have observed Raman, Rayleigh, and recoil-induced resonances (RIR) in a continuous beam of slow and cold cesium atoms extracted from a two-dimensional (2D) magneto-optical-trap (MOT) with the moving molasses technique. The RIR enabled us to measure the velocity distribution. therefore the average speed (0.6-4 m/s) and temperature (50-500 muK) of the atomic beam. Compared to time of flight, this technique has the advantage of being local, more sensitive in the low-velocity regime (v
  • Publication
    Métadonnées seulement
    Self-aligned extended-cavity diode laser stabilized by the Zeeman effect on the cesium D-2 line
    (2000)
    Lecomte, Steve
    ;
    Fretel, Emmanuel
    ;
    Mileti, Gaetano 
    ;
    Thomann, Pierre 
    An extended-cavity diode laser at 852 nm has been built especially for the purpose of cooling and probing cesium atoms. It is a compact, self-aligned, and continuously tunable laser source having a 100-kHz linewidth and 60-mW output power. The electronic control of the laser frequency by the piezodriven external reflector covers a 4.5-kHz bandwidth, allowing full compensation of acoustic frequency noise without any adverse effect on the laser intensity noise. We locked this laser to Doppler-free resonances on the cesium D-2 line by using the Zeeman modulation technique, resulting in the frequency and the intensity of the laser beam being unmodulated. We also tuned the locked laser frequency over a span of 120 MHz by using the de Zeeman effect to shift the F = 4-F' = 5 reference transition. (C) 2000 Optical Society of America. OCIS codes: 140.2020, 140.3570, 140.3600, 260.7490, 300.6460.
  • Publication
    Métadonnées seulement
    Bright, slow, and continuous beam of laser-cooled cesium atoms
    (1999)
    Berthoud, Patrick
    ;
    Fretel, Emmanuel
    ;
    Thomann, Pierre 
    By the moving molasses technique we have extracted laser-cooled cesium atoms in a continuous way directly from an optical molasses. The mean launching velocity is precisely tunable from 1 to 12 m/s. The atomic beam has a flux of 1.3 x 10(8) atom/s at 7 m/s and a longitudinal temperature of 70 mu K; which represents the highest flux and lowest velocity spread obtained so far in a continuous beam of cold atoms. These features makes it well suited for atomic fountains. The atomic flux can be slightly increased in a two-dimensional magneto-optical trap operation (+40%). A simple model accounts for the observed dependence of the flux with the magnetic-field gradient. [S1050-2947(99)51212-2].