Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.86: Poster
Montag, 17. März 2014, 16:30–18:30, Spree-Palais
Postcorrection of Vibrational Noise in an Atomic Gravimeter — •Christian Meiners, Henning Albers, Logan Richardson, Dennis Schlippert, Jonas Hartwig, Wolfgang Ertmer, and Ernst M. Rasel — Institut für Quantenoptik and Centre for Quantum Engineering and Space-Time Research - QUEST, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover, Germany
We present a study of the performance of a gravimeter based on free falling atoms, correlated with classical seismometers to correct for vibrational noise. This is of particular interest in regard to future mobile applications.
The source consists of a combined 2D- and 3D MOT setup for Rb87, delivering clouds of 109 atoms within 1 second at 3 µK. With a π/2 − π − π/2 combination of raman pulses seperated by equal time intervals T, a Mach-Zehnder-type interferometer is realised, which is sensitive to the acceleration of the atoms relative to the retro reflection mirror for the raman pulses. Even though the retro reflector is mounted on a commercial vibration isolation platform, the short term stability is limited to 6· 10−7 g/√Hz due to residual vibrational noise. To circumvent this limitation, we employ a postcorrection algorithm to correct the signal of the atom interferometer for the AC-acceleration of the mirror using a classical seismometer. For optimal correlation, the frequency response of the seismometer has to be taken into account and digital filter routines are investigated. Finally we present a comparative study of different seismometers used to measure the correction phase.