Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster V

A 26.6: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent C

ORKA - Design of a cavity enhanced optical dipole trap for the preparation of a Rb87 BEC — •Marius Prinz, Jan Eric Stiehler, Marian Woltmann, and Sven Herrmann — Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Germany

The LASERs commonly used in optical traps for evaporative cooling to prepare ultra-cold atoms and generate BECs usually come with the downside of a high power budget. A more energy efficient and compact solution for optical dipole traps is to resonantly enhance a low-power trapping laser in a bow tie cavity. In the ORKA project we aim to exploit this to generate a crossed optical dipole trap for preparation of a Rb87 BEC with an input laser power <50 mW. This allows for an experimental setup with a reduced space- and power-budget as compared to commonly used dipole traps, so it can be used for matter-wave-interferometry and microgravity experiments at the Bremen Gravitower Pro. Here we present the properties of our bow tie cavity and the experiment design compatible with the constraints of operation in a drop tower capsule. Our simulations predict an optical dipole trap suitable for BEC preparation with an input power <10 mW using a bow tie cavity with a finesse of >15k for both 780nm and 1064nm. The ability to manipulate the atoms with near resonant light inside the cavity opens up a further avenue for interesting future research. The ORKA project is supported by the German Space Agency DLR with funds provided by the Federal Ministry for Economic Affairs and Climate Action under grant number DLR 50 WM 2267.

Keywords: dipole trap; BEC; bow tie cavity; microgravity; cold atoms