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Hannover 2020 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 18: Ultracold atoms, ions, and BEC III (joint session A/Q)

Q 18.3: Vortrag

Dienstag, 10. März 2020, 14:45–15:00, f303

Delta-kick collimation in dynamic time averaged optical potentials — •Henning Albers1, Alexander Herbst1, Ashwin Rajagopalan1, Wolfgang Ertmer1, Ernst M. Rasel1, Dennis Schlippert1, and The PRIMUS-Team21Institut für Quantenoptik, Leibniz Universität Hannover — 2ZARM, Universität Bremen

The precision of atom interferometers highly depends on the center-of-mass motion and the expansion rate of the atomic ensemble. By reducing the latter, systematic effects, e.g. through wavefront aberration, can be reduced. In our setup we perform evaporative cooling in a dynamic time averaged optical dipole trap, generated by spatial modulation of the trapping beams in the horizontal plane, yielding 2×105 condensed atoms after 3 s of evaporation. Subsequently we carry out delta-kick collimation (DKC). Beyond pulsed DKC, we use a trapped scheme keeping the atoms captured the entire time. DKC can be performed at any stage of evaporative cooling, thus short-cutting the generation of ultra-cold effective temperatures. In this talk we will show the results of fast BEC production and discuss the DKC results as well as limitations and the perspective of generating up to 106 delta-kicked condensed atoms within 1 s.
This work is funded by the DLR with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) under grant number DLR 50 WM 1641 (PRIMUS), the Federal Ministry of Education and Research (BMBF) through the funding program Photonics Research Germany (contract number 13N14875), and the DFG under Germany’s Excellence Strategy (EXC 2123) "QuantumFrontiers".

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