Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 62: Poster: Quantum Optics and Photonics III
Q 62.37: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Gravimetry with ultra-cold atoms based on atom-chip sources — •Matthias Gersemann1, Jonas Matthias1, Maral Sahelgozin1, Holger Ahlers1, Sven Abend1, Martina Gebbe2, Hauke Müntinga2, Waldemar Herr1, Wolfgang Ertmer1, and Ernst Maria Rasel1 — 1Institut für Quantenoptik, LU Hannover — 2ZARM, Universität Bremen
Today atom-chip based setups provide the reliable generation of ultra-cold atomic ensembles and appear therefore as ideal sources for atom interferometry. We present a setup based on such a source in combination with Bragg-type beam splitters to coherently manipulate not only BECs of 87Rb atoms but furthermore magnetically lensed ensembles. The main advantage of the extremely low momentum spread of a collimated BEC lies in the reduction of systematic errors arising from wave front inhomogeneities of the beam splitting light fields, which is a limitation to the precision of the current generation atomic gravimeters. On this poster, we discuss the application of atom-chip technology to atomic gravimetry under consideration of effective atomic flux, atomic sample temperature equivalent, and compactness of the experimental setup. We also study the application of new interferometer topologies accessible with atomic samples of low momentum spread in order to increase the sensitivity and find out more about limitations to ultra-cold gravimeters.
This work is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Technology (BMWi) under grant number DLR 50WM1131.