München 2019 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

GR 14: Poster Session (posters are permanently on display)

GR 14.16: Poster

Donnerstag, 21. März 2019, 16:30–18:30, HS 6

Pre-Stabilized Laser System for Ground Based Gravitational Wave Detectors — •Fabian Meylahn and Benno Willke — Max Planck Institute for Gravitational Physics, Hannover, Germany

Current gravitational wave detectors (GWDs) are Fabry-Pérot dual-recycling laser interferometers, which sense space-time strain caused by gravitational waves. Besides many other subsystems, they require a low noise, high power pre-stabilized laser system to reach their design sensitivity. In such a laser system power stability and frequency stability is achieved by feedback control, so that noise does not couple significantly to the readout of the interferometer.

Here we present improvements of the solid state laser systems at 1064nm wavelength for current GWDs (aLIGO [1], Virgo[2]). These laser systems show a reduced noise and operate at 100W of laser power.

In addition we started to setup a pre-stabilized laser system at 1550nm wavelength for future GWDs (ET[3]). This laser system operates at a wavelength usable with cryogenically cooled silicon test masses. We characterized the free running noise of the laser and started to implement active stabilizations.

[1] J. Aasi et al. (LIGO Scientific Collaboration), Class. Quantum Gravity 32, 074001 (2015).

[2] F. Acernese et al. (Virgo Collaboration), Class. Quantum Gravity 32, 024001 (2014).

[3]ET Science Team, ET conceptual design document ET-0106C-10, http://www.et-gw.eu/index.php/etdsdocument