SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Poster IV
Q 59.13: Poster
Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof
A state-of-the-art suppression of seismic noise. The Seismic attenuation for Very Long Baseline Atom Interferometry — •Jonas Klußmeyer, Sebastian Bode, Klaus Zipfel, Christian Schubert, Ernst M. Rasel, and Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik
The increased separation time of atomic ensembles in a Very Long Baseline Atom Interferometer (VLBAI) allows one to scale up the sensitivity to inertial effects. Likewise, however this also increase the sensitivity to seismic noise introduced by the retro reflection mirror, which acts as an inertial reference. This noise source limits State-of-the-art atom interferometers (AI).
Here we present the VLBAI Seismic Attenuation System (SAS), which combines passive seismic attenuation in all degrees of freedom via an inverted pendulum hanging on geometric anti-springs with a vertical resonance frequency of 320 mHz. In order to suppress residual motion at the resonance, we aim for an active feedback utilizing various inertial sensors and actuators. The estimated instability using the SAS as an inertial reference has been calculated to around 10−6 m/s2 per shot (drop: 2T=0.8 s, launch: 2T=2.8 s). Measuring the residual motion using an out-of-loop low-noise seismometer opens the path for either a direct feedback on the laser phase or a post-correction of the AI signal for reaching a 10−9 m/s2 per shot instability, close to the shot noise limit for our 106 atoms.