Abstract

A new modified fused-silica glass whose coefficient of thermal expansion at 20°C is less than 125 that of fused silica is described. It should be particularly useful for large, first-surface mirrors and in other applications where extremely low expansion is desirable. Both solid and lightweight telescope mirror blanks can be constructed using fusion techniques. A discussion of a number of physical properties is included.

© 1968 Optical Society of America

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