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Q: Fachverband Quantenoptik und Photonik

Q 59: Poster IV

Q 59.76: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Laser Power Stabilization via Radiation Pressure — •Graziano Pascale, Marina Trad Nery, and Benno Willke — Max Planck Institute for Gravitational Physics (AEI), Hannover

This work reports a new scheme for laser power stabilization in which the power fluctuations of a laser beam are detected via the radiation pressure they produce in a suspended mirror. The ultimate goal of this experiment is to demonstrate an improved technique for power stabilization that can be implemented in the future generations of Gravitational Wave Detectors (GWDs). Most of the current stabilization techniques rely on sensing a small fraction of the laser power by a photodetector. These techniques are fundamentally limited by the high relative shot noise in the photodetector, which couples as sensing noise in the feedback loop.

To overcome this limit, the technique presented on this poster consists on sensing the full beam power of the laser via radiation pressure in a highly reflective micro-oscillator mirror. A proof of principle experiment has been successfully demonstrated in the past years and now an upgraded version is being setup. A key component of the current experiment is a novel micro-oscillator mirror with a spring constant smaller than 10-5 N/m and that might withstand 4 W of power. With the experiment presented in this poster, we want to demonstrate a relative power noise below 10^(-9) Hz^(-(1/2)) at frequencies around 10 Hz, which might be required in future GWDs.