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Paper: Interferometric Characterisation of Path Length Errors Resulting from Mirror Surface Topography with Sub-nm Reproducibility
Volume: 467, 9th LISA Symposium
Page: 297
Authors: Kögel, H.; Gohlke, M.; Pijnenburg, J.; Gerardi, D.; Schuldt, T.; Johann, U.; Braxmaier, C.; Weise, D.
Abstract: We present the results of our experimental characterisation of path length errors, caused by beamwalk over the surface topography of laser mirrors. These path length errors can have a major influence on the accuracy of the LISA measurement instrument in Astrium's alternative payload concept with In-Field Pointing. Our measurement setup uses a highly sensitive heterodyne interferometer for measuring the path length error amplitudes, generated by the topography of a moving, λ/10 test mirror.
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