SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 11: Precision Measurements: Gravity I

Q 11.2: Talk

Monday, March 6, 2023, 17:15–17:30, E214

Dual balanced readout for scattered light noise suppression in gravitational wave detection — •André Lohde, Daniel Voigt, and Oliver Gerberding — Institut für Experimentalphysik, Universität Hamburg, Hamburg, Germany

Gravitational wave interferometers are highly sensitive to scattered light noise. This is due to the interfering character of straylight back-scattered into the interferometer that is potentially modulated at moving surfaces. Today's interferometers, such as LIGO, Virgo and KAGRA are already limited by scattered light noise in the low frequency domain. Future detectors, however, such as the Einstein Telescope, depend upon advanced scattered light mitigation to fulfill design requirements.

Here, I present the technique of implementing two balanced homodyne detectors for the readout of a Michelson interferometer. This technique promises to allow partial subtraction of scattered light noise by simple arithmetic operations and thus improval of the sensitivity of gravitational wave detectors.