Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 13: Trapping and Cooling of Atoms (joint session Q/A)

A 13.6: Talk

Tuesday, March 12, 2024, 12:30–12:45, HS 1221

ORKA - Towards a cavity enhanced Optical Dipole Trap for evaporative cooling of Rb87 in microgravity — •Jan Eric Stiehler, Marius Prinz, Marian Woltmann, and Sven Herrmann — Center of Applied Space Technology and Microgravity (ZARM), University of Bremen, Germany

Evaporative cooling in optical traps is a common method to prepare ultra-cold quantum gases and generate Bose Einstein condensates (BEC). This usually comes at the prize of an increased power budget for the trapping laser. For setups that require to be energy efficient e.g. in space, magnetic chip traps are thus often preferred. However, these also come with certain limitations and lack some of the benefits of all-optical trapping and cooling. As an alternative we are investigating the use of a resonantly enhanced optical dipole trap for Rb87 to mitigate the power needs of all-optical evaporative cooling. We plan to employ a bow-tie cavity for evaporative cooling to a BEC, to be used as a matterwave source for interferometry in free fall experiments at the the Bremen Gravitower Pro facility. In this talk we will discuss the trade-off for our trapping scheme and present the resulting experiment design as well as simulation results for the bow-tie cavity trap. 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: BEC; all-optical; diploe trap; cavity; microgravity