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A: Fachverband Atomphysik

A 16: Ultra-cold atoms, ions, and BEC (joint session A/Q)

A 16.25: Poster

Mittwoch, 22. September 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.