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A series of glasses with low thermal expansion has been studied for the purpose of developing a mirror substrate. One particular composition has been found to have desirable optical fabrication characteristics of ease of grinding and polishing. The approach in tailoring the thermal expansion with the chemical composition is explained. 1.
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Tryggve Baak, Paul T. Jones, "Low-expanding mirror glass," Proc. SPIE 1327, Properties and Characteristics of Optical Glass II, (1 October 1990); https://doi.org/10.1117/12.22538