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Q: Fachverband Quantenoptik und Photonik

Q 31: Photonics I

Q 31.1: Vortrag

Mittwoch, 16. März 2022, 10:30–10:45, Q-H15

Wavefront characterization and simulation for high precision interferometry — •Kevin Weber, Gudrun Wanner, and Gerhard Heinzel — Albert Einstein Institut, Hannover, Niedersachsen

High precision interferometry with laser light is the foundation of many modern experiments. To further improve their incredible precision, an exact knowledge of the beam geometries involved is crucial. We present a novel means to measure and quantify beam geometries and its impact on readout signals. By combining the readout of a wavefront sensor with an in-house beamfitting algorithm, we will create a precise mathematical model of an experimental beam as a superposition of transversal electromagnetic modes. The presence of Higher-order mode contaminants are likely to negatively impact measurements. Therefore, we propose a way to study their influence in the future, namely by simulating the interferometric readout using the existing in-house C++ library IfoCAD. Insight gained on the influence of beam geometries on optical readout will contribute to the success of future geodesy and gravitational wave detector missions.