Vignette d'image

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

Résultat de la recherche

Filtres

4
4
4
Réinitialiser les filtres

Paramètres

Voici les éléments 1 - 4 sur 4
  • 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
    Microfabricated rubidium vapour cell with a thick glass core for small-scale atomic clock applications
    Pétremand, Yves
    ;
    Affolderbach, Christoph 
    ;
    Straessle, Rahel
    ;
    Pellaton, Matthieu 
    ;
    Briand, Danick
    ;
    Mileti, Gaetano 
    ;
    de Rooij, Nicolaas F.
    This paper presents a new fabrication method to manufacture alkali reference cells having dimensions larger than standard micromachined cells and smaller than glass-blown ones, for use in compact atomic devices such as vapour-cell atomic clocks or magnetometers. The technology is based on anodic bonding of silicon and relatively thick glass wafers and fills a gap in cell sizes and technologies available up to now: on one side, microfabrication technologies with typical dimensions ≤ 2 mm and on the other side, classical glass-blowing technologies for typical dimensions of about 6–10 mm or larger. The fabrication process is described for cells containing atomic Rb and spectroscopic measurements (optical absorption spectrum and double resonance) are reported. The analysis of the bonding strength of our cells was performed and shows that the first anodic bonding steps exhibit higher bonding strengths than the later ones. The spectroscopic results show a good quality of the cells. From the double-resonance signals, we predict a clock stability of ≈3 × 10−11 at 1 s of integration time, which compares well to the performance of compact commercial Rb atomic clocks.
  • Publication
    Accès libre
    Study of laser-pumped double-resonance clock signals using a microfabricated cell
    Pellaton, Matthieu 
    ;
    Affolderbach, Christoph 
    ;
    Pétremand, Yves
    ;
    de Rooij, Nicolaas F.
    ;
    Mileti, Gaetano 
    We present our microwave spectroscopic studies on laser–microwave double-resonance (DR) signals obtained from a micro-fabricated Rb vapor cell. This study focuses on the characteristics and systematic shifts of the ground-state 'clock transition' in 87Rb (
  • Publication
    Accès libre
    Microfabricated Chip-Scale Rubidium Plasma Light Source for Miniature Atomic Clocks
    Venkatraman, Vinu
    ;
    Pétremand, Yves
    ;
    Affolderbach, Christoph 
    ;
    Mileti, Gaetano 
    ;
    de Rooij, Nicolaas F.
    ;
    Shea, Herbert
    We present the microfabrication and characterization of a low-power, chip-scale Rb plasma light source, designed for optical pumping in miniature atomic clocks. A dielectric barrier discharge (DBD) configuration is used to ignite a Rb plasma in a micro-fabricated Rb vapor cell on which external indium electrodes were deposited. The device is electrically driven at frequencies between 1 and 36 MHz, and emits 140 μW of stable optical power while coupling less than 6 mW of electrical power to the discharge cell. Optical powers of up to 15 and 9 μW are emitted on the Rb D2 and D1 lines, respectively. Continuous operation of the light source for several weeks has been demonstrated, showing its capacity to maintain stable optical excitation of Rb atoms in chip-scale double-resonance atomic clocks.