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Proceedings Paper

Underlying causes of hygroscopic stability in high-quality replicated composite optics
Author(s): Geena Ferrelli; Hyun Kim; Rafael Zaldivar
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Paper Abstract

As next-generation space-based telescopes require larger mirrors, replicated composite optics are gaining increased attention due to limitations in scalability of conventional glass optics. Replication is the process of transferring an optical surface to a thin polymeric film supported by a CFRP substrate, offering weight savings, cost reductions, and faster manufacturing times. These optical surfaces require both dimensional precision (RMS < 32nm) and dimensional stability in a variety of environments. In our previous work, high quality replications were fabricated with UV-cured epoxy resin. Our work showed that the class of resin material as well as the processing route chosen had significant effects on the final stability of the composite optic. However, the fundamental material properties governing the behavior are not yet fully understood. In this paper, we will investigate how varying amounts of photoinitiator concentration on a UV-cured epoxy affect inherent material properties. The influence of these properties on the hygroscopic stability of the resin will be discussed.

Paper Details

Date Published: 14 May 2019
PDF: 13 pages
Proc. SPIE 10998, Advanced Optics for Imaging Applications: UV through LWIR IV, 1099809 (14 May 2019); doi: 10.1117/12.2519673
Show Author Affiliations
Geena Ferrelli, The Aerospace Corp. (United States)
Hyun Kim, The Aerospace Corp. (United States)
Rafael Zaldivar, The Aerospace Corp. (United States)

Published in SPIE Proceedings Vol. 10998:
Advanced Optics for Imaging Applications: UV through LWIR IV
Jay N. Vizgaitis; Peter L. Marasco; Jasbinder S. Sanghera, Editor(s)

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