STAGE Realization and characterization of a slow and intense source of Ytterbium for atom interferometry

Date de mise à jour de l’offre

Centre national de la recherche scientifique (CNRS) IDF Villejuif :

Le Centre national de la recherche scientifique est un organisme public de recherche pluridisciplinaire placé sous la tutelle du ministère de l’Enseignement supérieur, de la Recherche et de l’Innovation. Missions : faire de la recherche scientifique, valoriser les résultats, partager les connaissances, former par la recherche, contribuer à la politique scientifique.

Description de la mission

Light-pulse atom interferometry, where light pulses are used to coherently split and recombine atom wave-packets, has led to extremely sensitive and accurate inertial sensors that can be used to perform very stringent tests of fundamental physics such as: testing the equivalence principle, detecting gravitational waves, probing short-range forces or measuring fundamental constants (e.g. Newton’s gravitational constant or the fine-structure constant). Usually, these quantum sensors use mainly two-photon transitions on alkaline atoms (rubidium, cesium, ...). However, some of the most demanding applications in fundamental physics, such as the detection of gravitational waves or the search for a dark matter signature, require a substantial gain in sensitivity. One solution is to perform atomic diffraction using 1-photon transitions to metastable levels (optical clock transitions), which would reduce laser phase noise. Alkaline earth or rare earth atoms (strontium, ytterbium, calcium, ...), which have already been used to make optical clocks, are very good candidates.

The atom interferometry team at LKB is currently designing and building a new experimental setup to trap and laser-cool ytterbium (Yb) atoms for i) developing new advanced tools for atom interferometry based on continuous-wave as well as on frequency-comb lasers and ii) in the long term, measuring by atom interferometry the recoil of Yb atoms upon absorption or emission of photons. Importantly, this measurement would provide a new and independent determination of the fine-structure constant for a stringent test of the Standard Model.

Profil recherché

Bachelor thesis work, research activities:
This work will focus on the realization and characterization of the new Ytterbium source. This involves:
• the design and implementation of the detection system
• the calculation of the expected detection signal
• characterizing the hot atomic beam
• locking the laser on the atomic absorption signal
• setting up the optical beam-path, including an acousto-optic modulator (AOM), to slow the atomic beam using the Doppler and Zeeman effects

Skills gained:
• Experience with optics incl. AOMs, lasers, …
• Experience in laser-cooling and manipulation of atoms
• Experience with electronics
• Experimental interfacing (Python) and data analysis
• Introduction to cutting-edge experiments on atom interferometry

Niveau de qualification requis

Bac + 3
  • Employeur
    Centre national de la recherche scientifique (CNRS) IDF Villejuif
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    Plus de 250 salariés
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 2 mois et jusqu'à 4 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 3
  • Lieu du stage
    Laboratoire Kastler Brossel Sorbonne Université
    4, place de Jussieu
    75005 PARIS 5E ARRONDISSEMENT
  • Accès et transports
    RATP, Bus (https://www.ratp.fr/), SNCF (https://www.sncf.com/fr)