SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Precision Measurements: Gravity I

Q 11.4: Talk

Monday, March 6, 2023, 17:45–18:00, E214

Compact Laser Interferometer for Testmass Readout in Gravitational Wave Detectors — •Wanda Vossius, Meenakshi Mahesh, Tobias Eckhardt, Leander Göbbels, and Oliver Gerberding — Institut für Experimentalphysik, Geb. 68 Z. 21-21c, Luruper Chaussee 149, 22761 Hamburg, Deutschland

In order to realise the sensitivity required for future gravitational wave detectors, there is a need for an increase of three orders of magnitude for the precision of the testmass readout. This would decrease the noise at frequencies below 10Hz and allow for the detection of gravitational waves of lower amplitude. Local displacement sensors in gravitational wave detectors have to be both compact and stable without the need for readjustment while the detector is running.

We present the plan and current status on a compact readout sensor in the form of an interferometer. This interferometer is only 3 cm long with an armlength of about 5 cm. It contains a single quasimonolithic optic which results in an unequal armlength Michelson interferometer with a dual port readout. In order to reduce the coupling of electronic noise and ghostbeams into the readout, we plan to use a Deep Frequency Modulation on the laser. To ensure the stability criteria, the optical components will be glued onto a titanium carrier.