Replicated composite mirrors employing a thin epoxy replicated layer (RL) offer an attractive solution for the next generation of space optics due to weight reduction, cost savings, and more rapid manufacturing times over traditional glass mirrors. Although replicated mirrors have been studied for decades, the use of conventional mold release has limited their optical quality which necessitate substantial post polishing. We have investigated the use of a self-assembled monolayer (SAM) as the mold release agent for the manufacture of ultrahigh quality replicated mirrors. The molecular-scale thickness and uniformity of a SAM coating appear ideal for high-fidelity replication, however, it was found that defects and pinholes in the SAM cause relatively high release forces, resulting in surface distortion of the replica mirror. Optimization of the SAM coating processing as well as incorporation of a secondary lower-molecular-weight reagent significantly reduced the defect density and improved the surface figure error (SFE) of the as-replicated mirrors. We will discuss XPS, AFM, and surface interferometric imaging results as a function of the SAM optimization process. Additionally, the initial SFE must remain stable under varying hygrothermal and radiative environments for successful space mission. Therefore, we will discuss further post-processing treatments (humidity, thermal and radiation exposures) of the epoxy RL that are critical for the stability of lightweight replicated mirrors

Monolayer anti-adhesion coatings for high-quality replicated optics

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ACS Fall 2022

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.