München 2019 – wissenschaftliches Programm

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GR: Fachverband Gravitation und Relativitätstheorie

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

GR 14.11: Poster

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

Investigation towards fibre-based squeezed light injection into gravitational wave detectors — •Joscha Heinze — Max-Planck-Institute for Gravitational Physics, Hanover, Germany

It has been investigated whether a commercially available optical fibre can transport (squeezed) light at an efficiency which is sufficient for gravitational wave detectors. An incoupling efficiency of up to 99.1%, a power transmission of up to 97.9% and a visibility between two fibre output beams of 99.0% has been achieved. This corresponds to a maximum loss in the squeezing level of 4dB for initial 15dB.

The incoupling stage was found to be highly stable and the usage of non-angled fibre end faces as well as relatively large residual Fresnel reflections limited the results. This is, however, easy to improve on.

The performance may also be improved by using fibres with a larger core and lens-shaped end caps directly attached to the fibre end faces. Such a monolithic connection provides an even higher mechanical stability. Possible effects of the attachment procedure on the fibre output have been examined by comparing an untreated fibre to one that had a substrate (two plane faces) attached. The substrate-fibre showed a power transmission which was remarkably higher by 0.7% without any deterioration in the beam profile or polarisation extinction ratio.