Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Poster: Quantum Optics and Photonics II
Q 27.49: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Preparations for the LISA three-backlink experiment — •Lea Bischof1, Katharina-Sophie Isleif1, Oliver Gerberding1, Sonja Veith1, Michael Tröbs1,2, Karsten Danzmann1,2, and Gerhard Heinzel1,2 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover, 30167 Hannover — 2Max-Planck Institut für Gravitationsphysik (Albert Einstein Institut), 30167 Hannover
The Laser Interferometer Space Antenna (LISA) is a planned space-based, low-frequency gravitational wave detector with arm-lengths of several million kilometres and a displacement sensitivity in the order of 10 pm/√Hz. To suppress laser frequency noise in this detector two or more arms have to be compared to synthesize a quasi Michelson interferometer. This is non-trivial due to an orbit induced breathing of the angle between the arms, which requires an adaptable link (so-called backlink) between two optical benches in one satellite. Previous experiments at the AEI in Hannover have shown that a reciprocal fiber-based backlink is not an optimal solution, due to Rayleigh scattering induced noise. A new experiment is currently being set-up at the AEI in Hannover to compare this method with a free beam and a frequency-offset fiber-based implementation.
We will give an overview of this experiment and describe the required laser preparation set-up. Especially, we will show the current performance of our laser locking scheme that uses digitally controlled offset-frequency locks to stabilize four lasers to well defined relative frequencies and low laser frequency noise. This scheme is the basis for the heterodyne readout that we will use in the three backlink experiment.