Non-geometric tilt-to-length coupling in precision interferometry: mechanisms and analytical descriptions

This paper is the second in a set of two investigating tilt-to-length (TTL) coupling. TTL describes cross-coupling angular or translational jitter into an interferometric phase signal and important noise source precision interferometers, including space gravitational wave detectors like LISA. We discussed 10.1088/2040-8986/ac675e coupling effects originating from optical path length changes, i.e. geometric Within this work, we focus on wavefront detector geometry dependent coupling, called non-geometric case interfering fundamental Gaussian beams. characterise properties beams, their absolute relative angle at detector, offset individual beam parameters. Furthermore, discuss dependency detecting photodiode. Wherever possible, provide analytical expressions for expected effects. investigate walk due to mirror receiving system. These are directly compared with corresponding detected changes 10.1088/2040-8986/ac675e. Both together total readout. which cases cancel one-another. Additionally, list linear contributions that can be used counteract other Altogether, our results key knowledge minimise experiments by design realignment.