In the frame of an international R&D project, a team from Japan and Germany developed a replica process to manufacture a CFRP honeycomb mirror for visible application. The main target was to generate the optical surface with minimized effort to achieve a microroughness of better (1 – 2) nm RMS. This technology would enable the team to manufacture cost-effective mirrors for larger amounts, like for constellations. In this paper, we will present the recent results of this development and the finally achieved performance of a 300 mm light CFRP mirror. We will also present lessons learned for next steps of development to achieve such mirrors with an optical performance not only for microroughness but also for surface accuracy.
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