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First demonstration of neural sensing and control in a kilometer-scale gravitational wave observatory
Nikhil Mukund, James Lough, Aparna Bisht +9
Suspended optics in gravitational wave (GW) observatories are susceptible to alignment perturbations, particularly slow drifts over time, due to variations in temperature and seism…
First demonstration of 6 dB quantum noise reduction in a kilometer scale gravitational wave observatory
James Lough, Emil Schreiber, Fabio Bergamin +14
Photon shot noise, arising from the quantum-mechanical nature of the light, currently limits the sensitivity of all the gravitational wave observatories at frequencies above one ki…
GEO 600 and the GEO-HF upgrade program: successes and challenges
K. L. Dooley, J. R. Leong, T. Adams +25
The German-British laser-interferometric gravitational wave detector GEO 600 is in its 14th year of operation since its first lock in 2001. After GEO 600 participated in science ru…
Alignment sensing and control for squeezed vacuum states of light
Emil Schreiber, Kathrine L. Dooley, Henning Vahlbruch +10
Beam alignment is an important practical aspect of the application of squeezed states of light. Misalignments in the detection of squeezed light result in a reduction of the observ…
Phase Control of Squeezed Vacuum States of Light in Gravitational Wave Detectors
Katherine L Dooley, Emil Schreiber, Henning Vahlbruch +4
Quantum noise will be the dominant noise source for the advanced laser interferometric gravitational wave detectors currently under construction. Squeezing-enhanced laser interfero…
Thermal Correction of Astigmatism in the Gravitational Wave Observatory GEO 600
Holger Wittel, Harald Lück, Christoph Affeldt +10
The output port of GEO 600 is dominated by unwanted high order modes (HOMs). The current thermal actuation system, a ring heater behind one of the folding mirrors, causes a signifi…