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Q: Fachverband Quantenoptik und Photonik
Q 3: Precision Measurements and Metrology I
Q 3.8: Vortrag
Montag, 14. März 2022, 15:45–16:00, Q-H11
Dynamic Time-Averaged Optical Potentials for Atom Interferometry — •Henning Albers1, Alexander Herbst1, Vera Vollenkemper1, Ernst M. Rasel1, Dennis Schlippert1, and The PRIMUS-Team2 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2ZARM, Universität Bremen
Optical dipole traps are a commonly used tool for trapping and cooling neutral atoms.
However, typical dipole traps are disadvantaged compared to magnetic traps for example implemented on atom chip traps, due to their small trapping volume and lower evaporation speed.
The modulation of the center-position of dipole trap beams helps to overcome these limitations by creating large-volume time-averaged potentials with nearly arbitrary shape.
The properties of these kind of atom traps can be changed dynamically and allow for faster evaporative cooling as well as atom-optical elements like matter-wave lenses.
We use time-averaged optical potentials to generate Bose-Einstein condensates with up to 2×105 condensed 87Rb atoms after 3s of evaporative cooling.
Subsequently we apply an all-optical matter-wave lens by rapid decompression of the trap.
This change in trap confinement induces oscillations of the ensemble, that we stop by turning off the trap, when the size is at a maximum, which reduces the further expansion of the free falling cloud.
By means of this matter-wave lens we reduce the expansion temperature to 3nK in the horizontal directions.
We present the results of the matter-wave lens and discuss the impact of this technique when used as the source an inertial sensitive free fall atom interferometer.