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A: Fachverband Atomphysik
A 33: Poster VI
A 33.30: Poster
Donnerstag, 14. März 2024, 17:00–19:00, Tent A
All-optical matter-wave lensing to pK energie — •Alexander Herbst1, Timothé Estrampes1,2, Robin Corgier3, Wei Liu1, Knut Stolzenberg1, Eric Charron2, Ernst Rasel1, Naceur Gaaloul1, and Dennis Schlippert1 — 1Leibniz Universität Hannover, Institut für Quantenoptik, Welfengarten 1, 30167 Hannover, Germany — 2Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France — 3LNE-SYRTE, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université 61 avenue de l’Observatoire, 75014 Paris, France
We report on an all-optical collimation method for matter-waves, utilizing time-averaged potentials and tunable interactions. By rapid decompression of an optical dipole trap, we induce size oscillations to a BEC, which are then used to minimize the momentum spread of the ensemble with a well-timed release. Additionally, we choose 39K as atomic species which allows to tailor the atomic scattering length by means of magnetic Feshbach resonances. Minimizing interactions, we show an enhancement of the collimation compared to the strong interaction regime, realizing ballistic 2D expansion energies of 438 ± 77 pK in our experiment. We analyze the individual contributions to the ensemble dynamics, using an accurate simulation of our results. Based on our findings we present an advanced scenario which allows for 3D expansion energies below 16 pK by implementing an additional pulsed delta-kick collimation directly after release from the trapping potential.
Keywords: Bose-Einstein condensates; Matter-wave lens; Atom interferometry; Time-averaged optical potentials; Tunable interactions