SAMOP 2023 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Photonics II

Q 40.5: Talk

Wednesday, March 8, 2023, 15:30–15:45, F442

Modeling beam imperfection using Hermite-Gauss modes for interferometric simulations — •Kevin Weber, Gudrun Wanner, and Gerhard Heinzel — Albert Einstein Institut, Hannover, Germany

Precision laser interferometry is a widespread technique used across many disciplines due to its high measurement accuracy. Using such a technique allows us to see the changes in earth*s gravitational potential, as in the GRACE-FO mission, or enables us to detect ripples in space-time itself, known as gravitational waves, as in LIGO or VIRGO. For future missions which deploy inter-spacecraft interferometers, the prior knowledge of all noise contributions is crucial for its success. Until now, most of our simulations use only perfectly Gaussian or tophat beam geometries. However, experimental beams never possess the mathematically perfect shape the models assume. In this talk, we will discuss possible sources of noise contributions from imperfect beam geometries. Also, we show possible means to predict those using a system of Hermite-Gaussian modes as mathematical beam descriptions.