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Proceedings Paper

80-mm EFG sapphire dome blanks yield high-quality low-cost single-crystal domes
Author(s): John W. Locher; Herb E. Bates; W. C. Severn; Brian G. Pazol; Anthony C. DeFranzo
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Paper Abstract

Close attention to crystal growth parameters and characterization of the crystal's thermal environment during growth has led to improvement in the crystal structure of EFG grown dome blanks. These near net shape 80 mm sapphire blanks have been fabricated to produce high quality finished domes. New measurements of the coefficient of thermal expansion (CTE), thermal conductivity, optical scatter, rain erosion and the thermal coefficient of refractive index (dn/dT) as a function of wavelength have been performed and the data are presented.

Paper Details

Date Published: 14 December 1992
PDF: 7 pages
Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); doi: 10.1117/12.130785
Show Author Affiliations
John W. Locher, Saphikon Inc. (United States)
Herb E. Bates, Saphikon Inc. (United States)
W. C. Severn, Saphikon Inc. (United States)
Brian G. Pazol, Litton Itek Optical Systems (United States)
Anthony C. DeFranzo, Litton Itek Optical Systems (United States)

Published in SPIE Proceedings Vol. 1760:
Window and Dome Technologies and Materials III
Paul Klocek, Editor(s)

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