STAGE NEW DETECTION SYSTEM BASED ON LIGHT SHIFT ENGINEERING FOR A COLD-ATOM GYROSCOPE

Date de mise à jour de l’offre

SYRTE Observatoire de Paris :

Situé à l’Observatoire de Paris, le SYRTE - Systèmes de Référence Temps-Espace - est une unité mixte de recherche (UMR 8630) du CNRS, de l’Observatoire de Paris - Université PSL et de Sorbonne Université. Alliant recherche de très haut niveau et services scientifiques, le SYRTE se place aujourd’hui au premier rang international dans des champs disciplinaires variés : métrologie du temps et des fréquences, systèmes de référence célestes, rotation de la Terre, histoire de l’astronomie. La pluridisciplinarité du SYRTE se retrouve aussi dans ses compétences transverses - théorie, instrumentation, traitement et analyse de données - et dans la diversité de ses objectifs qui vont de la physique fondamentale jusqu’au transfert industriel.

Description de la mission

Inertial sensors with cold atoms offer many applications in fundamental physics (tests of the laws of gravitation, gravitational astronomy), geosciences (measurements of the gravity field or of Earth rotation) and inertial navigation (inertial units). The operation of these sensors is based on atomic interferometry taking advantage of superpositions between quantum states of different momentum of an atom. These superposition states are obtained by means of optical transitions with two (or more) photons communicating momentum to the atom and acting as separating plates and mirrors for the matter waves. SYRTE is a pioneer laboratory of the field, recognized worldwide for its expertise in the metrology of these quantum sensors, their use for different applications, and their technological transfer.

The aim of this internship is to contribute to the development of a new cold atom gyroscope currently operated at SYRTE. In order to increase the sampling rate of the gyroscope for future applications (in particular in seismology), the detection system must be modified in order to reduce the impact of the light scattered by the detected atoms on the atoms in the interferometer. To this aim, the new detection system will introduce differential light shifts (AC Stark shift) between the ground 6S_1/2 state and the excited 6P_3/2 state through the use of an auxiliary laser at 917 nm. A new laser system will be developed for this purpose. The work will include the stabilization of this laser on the reference laser (at 852 nm to manipulate Cesium atoms) with a transfer cavity, and the realization of the optical systems to combine the 852 and 917 nm lasers, intended to be directed onto the atoms.
In the case of a continuation as a PhD student, this laser system will be implemented on the gyroscope experiment to test its effectiveness on the immunity of the interferometer to the detected light.

Profil recherché

Required skills: optics and lasers, instrumentation, atomic physics, data analysis; ability to work in a team.

Niveau de qualification requis

Bac + 4/5 et +
  • Employeur
    SYRTE Observatoire de Paris
  • Secteur d’activité de la structure
    Enseignement - Formation - Recherche
  • Effectif de la structure
    De 51 à 250 salariés
  • Site internet de la structure
    https://syrte.obspm.fr
  • Type de stage ou contrat
    Stage pour lycéens et étudiants en formation initiale
  • Date prévisionnelle de démarrage
  • Durée du stage ou contrat
    Plus de 4 mois et jusqu'à 6 mois
  • Le stage est-il rémunéré ?
    Oui
  • Niveau de qualification requis

    Bac + 4/5 et +
  • Lieu du stage
    61, avenue de l’Observatoire,
    75014 PARIS 14E ARRONDISSEMENT
  • Accès et transports
    https://syrte.obspm.fr/spip/presentation/article/acces-au-site-de-l-observatoire-de-paris