Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 5: Precision Measurements and Metrology II (with Q)
A 5.1: Vortrag
Montag, 29. Februar 2016, 14:30–14:45, a310
Atom-chip fountain gravimeter — •Sven Abend1, Martina Gebbe2, Matthias Gersemann1, Hauke Müntinga2, Holger Ahlers1, Claus Lämmerzahl2, Wolfgang Ertmer1, Ernst M. Rasel1, and QUANTUS Team1,2,3,4,5,6,7 — 1Institut für Quantenoptik, LU Hannover — 2Zarm, U Bremen — 3Institut für Physik, HU Berlin — 4Institut für Laser-Physik, Hamburg — 5Institut für Quantenphysik, U Ulm — 6Institut für angewandte Physik, TU Darmstadt — 7Institut für Physik, JGU Mainz
We developed a simple but effective method to coherently relaunch atoms by a combination of double Bragg diffraction and Bloch oscillations in a single retro-reflected light field. This method provides a novel tool for atomic quantum sensors extending the free fall time without increasing their complexity. We demonstrate an atom-chip fountain gravimeter utilizing ultracold atoms, where all necessary atom-optics operations are realized by the atom-chip, including condensation, magnetic transfer and delta-kick cooling. The atom-chip itself even acts as a retro-reflector in vacuum for the beam splitter as inertial reference for gravity. This implementation allows for high contrast interferometry over tens of milliseconds in a volume as little as a one centimeter cube, paving the way for measurements with sub-µGal accuracies in miniaturized devices.
This work is supported by the German Space Agency (DLR) with funds provided by the Federal Ministry for Economic Affairs and Energy (BMWi) due to an enactment of the German Bundestag under grant numbers DLR 50WM1552-1557 (QUANTUS-IV-Fallturm).