Informations générales
Intitulé de l'offre : Structured lasers for new atomic clocks (M/F), master level (H/F)
Référence : UMR7614-LAUPRU-002
Nombre de Postes : 1
Lieu de travail : PARIS 05
Date de publication : mardi 22 juillet 2025
Type de contrat : CDD Doctorant
Durée du contrat : 36 mois
Date de début de la thèse : 1 octobre 2025
Quotité de travail : Complet
Rémunération : 2200 gross monthly
Section(s) CN : 04 - Physique des atomes, molécules et plasmas. Optique et lasers
Description du sujet de thèse
Structured lasers for new atomic clocks
In the context of new atomic clocks, we plan to trap atoms in an N-lobe structured laser placed at the center of a Fabry-Pérot optical cavity to create N identical dipole traps deep enough to contain the desired number of atoms.
The laser is structured by a spatial light modulator (SLM), which imposes a suitable phase to obtain the desired N-lobe structure at the center of the cavity, after a lens. Once the cold atoms are trapped in the N traps, they will be interrogated on the clock transition. Compared to the case with a single trap, we expect a lower atomic density and a clock transition less affected by collisional processes.
The proposed thesis will be carried out between LCPMR and LTE, with two people in charge. There are several aspects to be developed and studied.
The first one concerns the structuring of the laser into N identical lobes, and its compatibility with injection into the Fabry-Pérot optical cavity to achieve good coupling efficiency. This requires expertise in optics, lasers and modal analysis.
The second point concerns the trapping of atoms within the N dipole traps. This work will involve an upstream study to assess the trapping rate, and design a protocol enabling the traps to be upgraded from one to N. It requires a good expertise of numerical tools (Python, for example).
The third part of the project will involve testing the operation of the N-trap clock at LTE. It requires expertise in laser spectroscopy and a strong commitment to mastering atomic clock tools.
Contexte de travail
The thesis will be jointly directed by Laurence Pruvost (LCPMR, CNRS research director) and Jérôme Lodewyck (LTE, CNRS research fellow, HDR). Experimental activities will take place at both sites (separated by a 20-minute transport time), according to a predefined schedule.
Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.
Contraintes et risques
Constraints are essentially linked to the use of equipment and experimental set-ups. This means respecting access times and safety regulations.