Underlying causes of hygroscopic stability in high-quality replicated composite optics

Geena Ferrelli; Hyun Kim; Rafael Zaldivar

doi:10.1117/12.2519673

14 May 2019 Underlying causes of hygroscopic stability in high-quality replicated composite optics

Geena Ferrelli, Hyun Kim, Rafael Zaldivar

Proceedings Volume 10998, Advanced Optics for Imaging Applications: UV through LWIR IV; 1099809 (2019) https://doi.org/10.1117/12.2519673
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

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.

Citation Download Citation

Geena Ferrelli, Hyun Kim, and Rafael Zaldivar "Underlying causes of hygroscopic stability in high-quality replicated composite optics", Proc. SPIE 10998, Advanced Optics for Imaging Applications: UV through LWIR IV, 1099809 (14 May 2019); https://doi.org/10.1117/12.2519673

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