Stuttgart 2012 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 28: Präzisionsmessungen und Metrologie 4
Q 28.8: Talk
Tuesday, March 13, 2012, 15:45–16:00, V47.02
Towards a compact atom chip based gravimeter — •Holger Ahlers1, Ernst Maria Rasel1, and The QUANTUS-TEAM2,3,4,5,6,7,8,9 — 1Institut für Quantenoptik, LU Hannover — 2ZARM, Universität Bremen — 3Institut für Physik, HU Berlin — 4Institut für Laser-Physik, Universität Hamburg — 5Institut für Quantenphysik, Universität Ulm — 6Institut für angewandte Physik, TU Darmstadt — 7MUARC, University of Birmingham — 8FBH, Berlin — 9MPQ, Garching
Atom chips provide a promising atomic source for matter-wave interferometry in compact setups. They combine tight traps, low power requirements and integrated control features for cold atom experiments. In this talk we present our efforts to demonstrate a gravimeter using bragg scattering in our chip-based QUANTUS-I apparatus. We use the chip to prepare sub-recoil thermal atoms or a BEC in the F=2,mF=2 state and transfer to the mF=0 state via a chip-delivered RF adiabatic passage. The momentum width of the atomic ensemble is reduced by an intermediate δ-kick cooling step, leading to improved Bragg transfer efficiencies and better distinction between the spatially resolved interferometer output ports. First results using the Chip as a retroreflector for the bragg-beams are presented.
The QUANTUS project 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.