Freiburg 2024 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 42: Precision Measurements III (joint session Q/A)

A 42.6: Vortrag

Freitag, 15. März 2024, 15:45–16:00, HS 1221

First experiments in the Hannover Very Long Baseline Atom Interferometer facility — •Vishu Gupta¹, Kai Grensemann¹, Dorothee Tell¹, Ali Lezeik¹, Mario Montero¹, Jonas Klußmeyer¹, Klaus Zipfel¹, Christian Schubert^1,2, Ernst Rasel¹, and Dennis Schlippert¹ — ¹Leibniz Universität Hannover, Institut für Quantenoptik — ²Deutsches Zentrum für Luft und Raumfahrt, Institut für Satellitengeodasie und Inertialsensorik

The gravitational acceleration of freely falling atoms can be measured accurately by tracking their movement with vertical lattices of light in a matter-wave interferometer scheme. The Very Long Baseline Atom Interferometry (VLBAI) facility at the Hannover institute of technology allows for highly accurate inertial measurements with applications ranging from fundamental physics to geodesy. The 10 m baseline facility with Bose-Einstein Condensates (BECs) and high performance seismic attenuation system (SAS) raises great potential for absolute gravimeter. In the Hannover VLBAI facility, rubidium BECs will be launched into the 10 m baseline to perform interferometery based on Bragg momentum transfer. Here we present the recent development of the VLBAI facility. To this point the installation of the Hannover VLBAI facility is complete with the Bragg interferomtery laser system, an all-optical source of rubidium BEC and high-performance in-vacuum SAS. We demonstrate the current status of the all optical Rb-BEC source, first steps for passive vibration isolation using an SAS and the necessary methods such as matter-wave lenses and Bragg beam splitters for first inertial measurements.

Keywords: Atom interferometery; VLBAI; inertial sensing; vibration isolation; seismic attenuation system