Optimum selection of high performance mirror substrates for diamond finishing
2016
Due to advances in manufacturing processes, the substrate options for high performance diamond machined mirrors are
expanding. Fewer compromises have to be made to achieve the needed weight, stiffness and finish while maintaining
reasonable costs. In addition to the traditional mirror materials like aluminum and beryllium, there are some less
common materials that can now be included in the trade space that fill the cost and performance continuum between
wrought aluminum and beryllium mirrors. Aluminum and beryllium, respectively, had been the low cost/fair
performance and very high cost/very high performance bounds for substrate selection. These additional substrates
provide multiple near net shape blank options and processes, mostly within these bounds, that can be considered in a
mirror cost versus performance trade analysis.
This paper will include a summary of some advances in manufacturing processes that provide more substrate options for
diamond machined mirrors with some sample performance analysis and data. This is merged with the traditional
substrate options to illustrate the now larger mirror substrate trade space. Some benchmark structural analysis is
provided to back up a generic mirror design trade study.
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