Erlangen 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

K: Fachverband Kurzzeit- und angewandte Laserphysik

K 7: Laser-Beam Matter Interaction - Laser Applications II

K 7.1: Vortrag

Donnerstag, 17. März 2022, 14:00–14:15, K-H4

The Three-Backlink experiment: A phase reference distribution system for LISA. Design, construction and first measurements. — •Jiang Ji Ho Zhang, Lea Bischof, Stefan Ast, Daniel Jestrabek, Krishnapriya Rajasree, and Melanie Ast — Max Planck Institute for Gravitational Physics, Callinstraße 38, 30167 Hannover, Germany

LISA (Laser Interferometer Space Antenna) 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 are connected via a flexible optical link, the so-called backlink or phase reference distribution system (PRDS), which articulates the payload to compensate for the angular dynamics. The optical pathlength difference between two counter-propagating beams along the PRDS is required to reach 1 pm/√Hz stability. The Three-Backlink Experiment is a trade-off study between different designs of the PRDS: a direct fibre backlink, a frequency separated fibre backlink and a free beam backlink. To simulate the angular motion of the MOSAs, the experiment features two rotation stages, each containing a Zerodur plate to which fused silica optical components are bonded using UV glue. We report on the first measurements of the backlink non-reciprocity, a first step towards achieving the required performance for LISA.