Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 8: Precision Measurements I (joint session Q/A)

A 8.6: Talk

Monday, March 11, 2024, 18:15–18:30, HS 1221

Suppression of scattered light through tunable coherence in Sagnac-Speed-Meters — •Leonie Eggers, Daniel Voigt, and Oliver Gerberding — Universität Hamburg, Institut für Experimentalphysik, Germany

As scattered light noise is a dominating limitation for the sensitivity of gravitational wave detectors, we investigate the use of tunable coherence as a new concept to suppress scattered light.

Tunable coherence is realised by phase modulation following a pseudo-random sequence, which artificially shortens the coherence length of stable continuous wave lasers to the centimeter scale. While Sagnac-Speed-Meter topologies provide a potential alternative for the currently used Michelson-interferometers for future gravitational wave detectors, they suffer from the same limitations through scattered light, as well as the effect of light backscattering from the mirrors and coupling into the counter-propagating beam. We are investigating the use of tunable coherence in Sagnac-Speed-Meters to suppress scattered light through simulations and a tabletop experiment. We are presenting our recent findings on using tunable coherence in Sagnac-Speed-Meters.

Keywords: Gravitational Wave Detectors; Scattered Light; Sagnac-Speed-Meter; Tunable Coherence