SAMOP 2021 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 13: Ultra-cold atoms, ions, and BEC (joint session A/Q)
Q 13.25: Poster
Wednesday, September 22, 2021, 16:30–18:30, P
All-Optical Matter-Wave Lens for Atom Interferometry — •Henning Albers1, Alexander Herbst1, Ernst M. Rasel1, Dennis Schlippert1, and The Primus-Team2 — 1Institut für Quantenoptik, Leibniz Universität Hannover — 2ZARM, Universität Bremen
The instability of quantum based inertial sensors highly depends on the center-of-mass motion and the expansion rate of the atomic ensemble. Precise control of these degrees of freedom is essential to perform accurate measurements of inertial effects, such as rotations or accelerations. Using time-averaged potentials in a 2 µ m crossed dipole trap we realize an all optical matter-wave lens which can be applied at all stages of the evaporative cooling process. By rapid decompression of the trap confinement we induce size oscillations of the trapped ensemble. Turning off the trap at a turning point of this oscillation results in a reduced velocity spread of the atomic cloud and thus a lowered expansion rate. We are able to reduce the transverse expansion temperature of ensembles containing 4×105 atoms from 40nK down to 3nK. The current limitations as well as the perspective to lens in transversal and longitudinal direction will be discussed.