Title: Towards the LISA backlink: Experiment design for comparing optical phase reference distribution systems
Authors: Isleif, Katharina-Sophie 
Bischof, Lea
Ast, Stefan
Penkert, Daniel
Schwarze, Thomas S.
Barranco, Germán Fernández
Zwetz, Max
Veith, Sonja
Hennig, Jan Simon
Tröbs, Michael
Reiche, Jens
Gerberding, Oliver
Danzmann, Karsten
Heinzel, Gerhard
Language: eng
Keywords: gravitational wave detection;laser interferometer space antenna;laser interferometry;precision metrology;stray light
Issue Date: 14-Mar-2018
Document Type: Article
Journal / Series / Working Paper (HSU): Classical and Quantum Gravity
Volume: 35
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.
Organization Units (connected with the publication): Max Planck Institute for Gravitational Physics
ISSN: 0264-9381
1361-6382
Publisher DOI: 10.1088/1361-6382/aaa879
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