Glass ceramics for optical applications in the visible and infrared regions with low coefficient of thermal expansion

Hans-Georg Krolla; Wolfgang Semar

doi:10.1117/12.187383

28 September 1994 Glass ceramics for optical applications in the visible and infrared regions with low coefficient of thermal expansion

Hans-Georg Krolla, Wolfgang Semar

Author Affiliations +

Proceedings Volume 2286, Window and Dome Technologies and Materials IV; (1994) https://doi.org/10.1117/12.187383
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

A glass ceramic with high transmission values up to 4.5 micrometers and with extremely low thermal expansion is presented. In addition a large variety in shaping processes, for instance blocks of large dimensions, tubes, domes, and capillaries, are addressed. Furthermore a sintered cordierite glass ceramic is presented combining a low value in relative length change, a high temperature stability and a high transparency in the visible and median range infrared region. The properties include a high Young's modulus and a high Knoop hardness relative to normal IR-glasses. The application of the powder processing technique can be used successfully to prepare fully dense, complex-shaped articles.

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Hans-Georg Krolla and Wolfgang Semar "Glass ceramics for optical applications in the visible and infrared regions with low coefficient of thermal expansion", Proc. SPIE 2286, Window and Dome Technologies and Materials IV, (28 September 1994); https://doi.org/10.1117/12.187383

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