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Delicate diamond turned Aluminum optics (DTO's) were made much more durable by Hard Carbon Coating (HCC). Submasters, steel masters and glass master surfaces were also made more rugged by the application of Hard Carbon. Multiple replicas were successfully made from these Hard Carbon coated masters and submasters. The merging of these three technologies (DTO's, HCC, and replicated optics) could produce lower cost precision aspheric mirrors and lenses.
James A. McCandless
"Protecting Optical Replication Molds (Masters) With Hard Carbon", Proc. SPIE 0896, Replication and Molding of Optical Components, (13 July 1988); https://doi.org/10.1117/12.944458
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James A. McCandless, "Protecting Optical Replication Molds (Masters) With Hard Carbon," Proc. SPIE 0896, Replication and Molding of Optical Components, (13 July 1988); https://doi.org/10.1117/12.944458