Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 21: Precision Measurements and Metrology: Interferometry I
Q 21.6: Talk
Tuesday, March 7, 2017, 12:15–12:30, P 104
Transportable Quantum Gravimeter – QG-1 — •Maral Sahelgozin1, Jonas Matthias1, Nina Grove1, Sven Abend1, Waldemar Herr1, Jürgen Müller2, Wolfgang Ertmer1, and Ernst M. Rasel1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2Institut für Erdmessung, Leibniz Universität Hannover, Schneiderberg 50, 30167 Hannover
We present the design of our transportable Quantum Gravimeter – QG-1 and report on the progress of the implementation of an ultracold atomic ensemble loaded on our atom chip constituting the source for matter-wave interferometry. The characterization and optimization of our high flux double MOT system will be presented. In our gravimeter the narrow momentum width of the ensemble in combination with higher order Bragg type beamsplitters will be employed to improve the acceleration sensitivity. More crucially the extremely low momentum distribution of an ultracold atomic ensemble will reduce the systematic errors arising from wavefront inhomogeneities during the interrogation time. This is the major limitation to the accuracy of state-of-the-art atomic gravimeters and will be overcome by our absolute quantum gravimeter. By this our compact atom chip based source, miniaturized electronics and simplified telecom fiber based laser system provide a stable and accurate gravimeter for geodetic field applications.
This work is in the scope of the SFB 1128 geo-Q and supported by the Deutsche Forschungsgemeinschaft (DFG).