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Q: Fachverband Quantenoptik und Photonik
Q 63: Ultracold Atoms (Trapping and Cooling)
Q 63.4: Vortrag
Freitag, 15. März 2019, 11:15–11:30, S SR 211 Maschb.
Evaporative cooling in an optical dipole trap in microgravity — •Christian Vogt1, Marian Woltmann1, Sven Herrmann1, Claus Lämmerzahl1, and The PRIMUS-TEAM1,2 — 1University of Bremen, Center of Applied Space Technology and Microgravity (ZARM), 28359 Bremen — 2Institut für Quantenoptik, LU Hannover
Atom interferometers based on cold atoms have been turned into effective tools to measure weakest forces in the last decades. The sensitivity of these devices scales with the square of interrogation time, normally limited by the time of free fall. Operating atom interferometers in microgravity, like in the drop tower in Bremen, can extend this time from hundreds of milliseconds to several seconds. To take full advantage of the free fall time a fast atom preparation is required, where colder atomic clouds lead to smaller error contributions in the phase estimation. Evaporative cooling both determines the final temperature and in most cases limits the cooling cycle. While the process on ground is driven by gravity, measurements in microgravity revealed no significant differences in performance where the key is called the dimension of evaporation. This talk will be about recent results of evaporative cooling in microgravity. Furthermore techniques for fast and effective evaporation from optical dipole traps on ground and their applicability to microgravity environments on the example of the PRIMUS experiment will be discussed. The PRIMUS-Project is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry of Economic Affairs and Energy (BMWi) under grant number DLR 50 WM 1642.