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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
    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.
  • Publication
    Accès libre
    Sub-Doppler diode laser frequency stabilization with the DAVLL scheme on the D1 line of a 87Rb vapor-cell
    (2007)
    Giannini, R.
    ;
    Breschi, E.
    ;
    Affolderbach, Christoph 
    ;
    Bison, G.
    ;
    Mileti, G.
    ;
    Herzig, Hans-Peter
    ;
    Weis, A.
    We established an experimental set-up that allows laser stabilization using the Doppler1 and sub-Doppler2,3 Dichroic Atomic Vapor Laser Locking (DAVLL) and the Saturated Absorption (SA) scheme. In this report we present comparative studies between Doppler and sub-Doppler DAVLL using heterodyne frequency stability measurements with an independently SA stabilized laser. Some major sources of frequency instability are discussed together with ways to improve the stability. Special focus is laid on the sub-Doppler DAVLL stabilization technique where a new approach for getting higher stability is introduced. In our measurements, the 87Rb D1 line was used as reference atomic line.