Towards the LISA backlink: Experiment design for comparing optical phase reference distribution systems

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Isleif, K.-S.; Bischof, L.; Ast, S.; Penkert, D.; Schwarze, T.S. et al.: Towards the LISA backlink: Experiment design for comparing optical phase reference distribution systems. In: Classical and Quantum Gravity 35 (2018), Nr. 8, 85009. DOI: https://doi.org/10.1088/1361-6382/aaa879

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Abstract: 
LISA is a proposed space-based laser interferometer detecting gravitational waves by measuring distances between free-floating test masses housed in three satellites in a triangular constellation with laser links in-between. Each satellite contains two optical benches that are articulated by moving optical subassemblies for compensating the breathing angle in the constellation. The phase reference distribution system, also known as backlink, forms an optical bi-directional path between the intra-satellite benches. In this work we discuss phase reference implementations with a target non-reciprocity of at most 2π μrad Hz-1, equivalent to 1 pm √Hz-1 for a wavelength of 1064 nm in the frequency band from 0.1 mHz to 1 Hz. One phase reference uses a steered free beam connection, the other one a fiber together with additional laser frequencies. The noise characteristics of these implementations will be compared in a single interferometric set-up with a previously successfully tested direct fiber connection. We show the design of this interferometer created by optical simulations including ghost beam analysis, component alignment and noise estimation. First experimental results of a free beam laser link between two optical set-ups that are co-rotating by ±1° are presented. This experiment demonstrates sufficient thermal stability during rotation of less than 10-4 K √Hz-1 at 1 mHz and operation of the free beam steering mirror control over more than 1 week. © 2018 IOP Publishing Ltd Printed in the UK.
License of this version: CC BY 3.0
Document Type: article
Publishing status: publishedVersion
Issue Date: 2018
Appears in Collections:Fakultät für Mathematik und Physik

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1 image of flag of Germany Germany 66 75.86%
2 image of flag of France France 9 10.34%
3 image of flag of United States United States 3 3.45%
4 image of flag of Iraq Iraq 2 2.30%
5 image of flag of China China 2 2.30%
6 image of flag of Russian Federation Russian Federation 1 1.15%
7 image of flag of Netherlands Netherlands 1 1.15%
8 image of flag of Italy Italy 1 1.15%
9 image of flag of Finland Finland 1 1.15%
10 image of flag of Spain Spain 1 1.15%

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