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Measuring the impact of laser relative intensity noise on heterodyne interferometers using differential wavefront sensing

Heinzel, G.; Hewitson, M.; Wissel, L.

Laser-intensity fluctuations cause undesired phase noise even in balanced heterodyne interferometers. However, in space missions in particular, such as LISA Pathfinder or LISA, direct measurements of these fluctuations at the relevant frequencies are often not available. Hence, it can be challenging to estimate their impact on the interference pha…