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transfer blocking

A process used to control thickness and parallelism precisely during the production of plane-parallel plates. Elements are cemented to a blocking tool and their upper surfaces are polished. A second blocking tool is then cemented to the upper polished surface and the original blocking is released. As a result, the optical elements are transferred from the first to the second blocking tool without disrupting their particular positions. The second, or unfinished, surface is then polished.
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