SAMOP 2023 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Precision Measurements: Gravity I
Q 11.3: Vortrag
Montag, 6. März 2023, 17:30–17:45, E214
A Free-Beam Backlink for the Space-Based Gravitational Wave Detector LISA — •Daniel Jestrabek1,2, Lea Bischof1,2, Melanie Ast1,2, Jiang Ji Ho Zhang1,2, and Gerhard Heinzel1,2 — 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Hannover, Germany — 2Leibniz Universität Hannover, Hannover, Germany
The Laser Interferometer Space Antenna (LISA) will be the first Gravitational Wave Detector in space, consisting of three satellites forming an equilateral triangle of 2.5 million kilometers distance. The challenge introduced by the relative movements of the satellites can be overcome by the implementation of steerable optical benches to compensate for these changes. This makes an optical connection necessary that links the moving benches so that the gravitational wave signal can be extracted in post-processing. One possible solution for such an optical connection (also called "Backlink") is the use of mirrors that guide the light in free space between the benches. The mirrors must be actively steered to keep this Free-Beam Backlink stable. Control electronics were developed, tested, and implemented for the Free-Beam Backlink within a LISA-like test bed, the Three-Backlink Experiment. This test bed consists of two separate, rotatable benches in between which light is exchanged through three optical connections: the free-beam link and two fiber-based solutions.
We present here the working principle of the Free-Beam Backlink and its optimization, enabling stable heterodyne interference over separated optical benches with a low noise contribution.