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Affolderbach, Christoph

Nom
Affolderbach, Christoph
Affiliation principale
Fonction
Collaborateur scientifique
Email
christoph.affolderbach@unine.ch
Identifiants
https://libra.unine.ch/handle/123456789/478
_
0000-0003-0733-2991

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  • Publication
    Accès libre
    Light-shift suppression in laser optically pumped vapour-cell atomic frequency standards
    (2005)
    Affolderbach, Christoph 
    ;
    Andreeva, C.
    ;
    Cartaleva, S.
    ;
    Karaulanov, T.
    ;
    Mileti, Gaetano 
    ;
    Slavov, D
    We present a novel scheme for reducing the AC Stark effect in optical-microwave double-resonance spectroscopy and its application for efficient suppression of the light-shift-related instabilities in laser-pumped gas-cell atomic clocks. The method uses a multi-frequency pump light field that can be easily produced by frequency modulation of the single-frequency pump laser. We show theoretically that variations of the light shift with both laser frequency and light intensity can be strongly suppressed with properly chosen pump light spectra. Suitable modulation parameters can be found for both the case of pure frequency modulation as well as for pump light spectra showing amplitude-modulation contributions, as usually found for current modulation of diode lasers. We experimentally demonstrate the method for a Rb atomic clock using a frequency-modulated distributed Bragg-reflector laser diode as pump light source.
  • Publication
    Métadonnées seulement
    Light shift reduction in atomic clocks
    (2003-10-31)
    Affolderbach, Christoph 
    ;
    Andreeva, C.
    ;
    Cartaleva, S.
    ;
    Karaulanov, T.
    ;
    Mileti, Gaetano 
    ;
    Slavov, D.
    In this paper we present a detailed description of a method for reduction of the light shift in laser-pumped gas-cell atomic clocks. The method consists in using a multi-frequency optical pumping obtained through frequency modulation of the laser spectrum with precisely controllable parameters. Experimental evidence of a strong reduction of the frequency dependence of the LS in an optical pumping Rb gas-cell clock is demonstrated in a large frequency interval, which is in a very good agreement with the numerical estimations reported.
  • Publication
    Métadonnées seulement
    Frequency stability comparison of diode lasers locked to Doppler and sub-Doppler resonances
    (2003-10-31)
    Affolderbach, Christoph 
    ;
    Andreeva, C.
    ;
    Cartaleva, S.
    ;
    Mileti, Gaetano 
    ;
    Slavov, D.
    We present a systematic quantitative comparison of the performance parameters of two Extended Cavity Diode Lasers (ECDL), stabilized to Doppler and sub-Doppler profiles. The experimental study is carried out on Rb atomic vapour cells. The frequency shift of the resonance under investigation with respect to a reference resonance is measured and analyzed, in dependence on the modulation amplitude, cell temperature, laser power, applied magnetic field and misalignment of the pump-probe beams angle. The Allan variance is measured for both locking methods. It shows that the stabilization to the Doppler profile results in about one order of magnitude lower stability than the one to SA resonances for the short-term measurement. However, the stability achieved using both methods is sufficient for many applications and for some of them the simplicity of the Doppler locking method can be advantageous.