Demonstration of detuned dual recycling at the Garching 30m laser interferometer

TL;DR

This paper demonstrates the implementation of detuned dual recycling in a 30m laser interferometer, enhancing gravitational wave detection sensitivity by tuning the detector to specific frequency bands.

Contribution

It presents the first experimental demonstration of detuned dual recycling on a fully suspended prototype, including a control scheme for frequency tuning.

Findings

Good agreement between experimental results and simulations

Successful tuning of the detector to different frequencies

Enhanced signal-to-noise ratio in a limited bandwidth

Abstract

Dual recycling is an advanced optical technique to enhance the signal-to-noise ratio of laser interferometric gravitational wave detectors in a limited bandwidth. To optimise the center of this band with respect to Fourier frequencies of expected gravitational wave signals detuned dual recycling has to be implemented. We demonstrated detuned dual recycling on a fully suspended 30m prototype interferometer. A control scheme that allows to tune the detector to different frequencies will be outlined. Good agreement between the experimental results and numerical simulations has been achieved.