Abstract

Uniformity of thermal expansion has been measured for fused quartz (Heraeus-Amersil TO8E) and borosilicate glass (Schott Duran and Ohara E6). The variation of expansion coefficient for three melts of TO8E was 5 × 10⁻⁹/K over a temperature range of 300 to 100 K and was found to vary linearly with position in the melt. This spatial gradient averaged 3.5 × 10⁻¹¹/K cm. The room-temperature thermal expansivity variation of Duran (Tempax) glass was ~27 × 10⁻⁹/K, while that of E6 glass was ~52 × 10⁻⁹/K.

© 1984 Optical Society of America

Ultraprecise thermal expansion measurements of seven low expansion materials

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