Production tout optique de condensats de Bose-Einstein de 39K : des interactions contrôlables pour l’étude de gaz quantiques désordonnés en dimensions réduites

Guillaume Salomon 1
1 Laboratoire Charles Fabry / Optique atomique
LCF - Laboratoire Charles Fabry
Abstract : This thesis presents the all optical production of 39K Bose-Einstein condensates. A key point in the process is the sub-Doppler cooling that allows for an efficient loading of an optical dipole trap. To this aim we use a gray molasses scheme working on the blue side of the D1 line of this alkali that leads to a high phase space density and a high number of trapped atoms in a 1550 nm optical trap. The cloud is then polarized and compressed in a crossed dipole trap before starting an efficient forced evaporation close to a Feshbach resonance. This process allows us to produce Bose-Einstein condensates every 7 seconds with our experiment. Those degenerate clouds represent the starting point of experiments aiming to study the influence of disorder on quantum gases in low dimensions. We discuss the perspectives to study of the phase diagram of the two-dimensional disordered Bose gas as well as the Anderson localization phenomenon in two dimensions and the behaviour of bright solitons in a disordered potential in a one-dimensional geometry.
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Guillaume Salomon. Production tout optique de condensats de Bose-Einstein de 39K : des interactions contrôlables pour l’étude de gaz quantiques désordonnés en dimensions réduites. Optique [physics.optics]. Institut d’Optique Graduate School, 2014. Français. ⟨NNT : 2014IOTA0009⟩. ⟨tel-01127045⟩

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