Kavli Affiliate: Johannes Lehmann
| First 5 Authors: Alexandra Mitchell, Johannes Lehmann, Philip Koch, Samuel Cooper, Jesse van Dongen
| Summary:
Homodyne Quadrature Interferometers (HoQIs) are compact, low noise and high
dynamic range displacement sensors designed for use in gravitational wave
observatories. Their lower noise compared to the displacement sensors used at
present makes them valuable for improving the seismic isolation in current and
future detectors. This paper outlines the progression of this sensor from
initial production and benchtop tests to in-vacuum static performance and
installation in a gravitational wave detector prototype facility. A detailed
design description is outlined, including the full signal and optical chain
required for implementation in detectors. The measured in-vacuum static
performance indicates a noise floor of $3-4times10^{-13}m/sqrt{rm{Hz}}$ at
10Hz. Three HoQIs were installed on the beamsplitter suspension at the AEI 10m
prototype. They measured motion of the intermediate mass across the entire
bandwidth measured and showed minimal non-linearities and a good robustness to
motion in unmeasured degrees of freedom, both important for practical use in
dynamic systems such as seismic isolation.
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