SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Precision Measurements: Gravity I
Q 11.8: Vortrag
Montag, 6. März 2023, 18:45–19:00, E214
The Three-Backlink Experiment for the first space-based gravitational wave detector LISA — •Jiang Ji Ho Zhang1,2, Lea Bischof1,2, Daniel Jestrabek1,2, Melanie Ast1,2, Michael Born1,2, Katharina-Sophie Isleif3, Stefan Ast4, Nicole Knust1,2, Daniel Penkert1,2, and Gerhard Heinzel1,2 — 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Hannover, Germany — 2Leibniz Universität Hannover, Hannover, Germany — 3Deutsches Elektronen-Synchroton (DESY) Zeuthen, Hamburg, Germany — 4DLR-Institute for Satellite Geodesy and Inertial Sensing, Hannover, Germany
The Laser Interferometer Space Antenna (LISA) will be the first gravitational wave detector in space, aiming to use laser interferometry to detect gravitational wave signals in the 0.1 mHz to 1 Hz band. It consists of three satellites forming a near-equilateral triangle with 2.5 million km arms. Due to the orbital mechanics, the inter-satellite distances and angles vary by about 1% and 1.5% per year, respectively. Each satellite features two moving optical sub-assemblies (MOSAs) that compensate for the angular dynamics. They both carry one optical bench, which in turn are connected via a flexible optical link. This is the so-called Backlink. The noise of the optical pathlength difference between two counter propagating beams along the Backlink is required to reach 1 pm/sqrt(Hz) stability. The Three-Backlink Experiment is a trade-off study between different designs of the Backlink: two fiber-based and one free beam. Here, we report on the design and technical aspects of the experiment, the current status and the ongoing work.