Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 26: Poster – Precision Measurement, Metrology, and Quantum Effects

Q 26.38: Poster

Dienstag, 11. März 2025, 14:00–16:00, Tent

Stabilization of a tunable coherence laser system for scattered light suppression — •Lennart Manthey, Daniel Voigt, and Oliver Gerberding — Institut für Experimentalphysik, Universität Hamburg, 22761 Hamburg, Germany

Scattered light limits the sensitivity of laser interferometric ground based gravitational wave detectors. To suppress this noise, we test tunable coherence which uses pseudo-random-noise (PRN) phase modulations. We showed suppression levels of 40dB for 170kHz scatter frequency in Michelson interferometers are possible. To achieve better results at lower measurement frequencies of 3Hz to 10kHz a stabilization of the laser amplitude and frequency is needed. The amplitude stabilization uses a photodiode connected in a control loop to actuate the diode voltage of the laser. The frequency stabilization uses an ultra-stable cavity to lock the frequency on its length. We present the status of our noise level of the amplitude and frequency and its effects on the scattered light suppression.

Keywords: gravitational wave physics; scattered light; laser stabilization