80-mm EFG sapphire dome blanks yield high-quality low-cost single-crystal domes

John W. Locher; Herb E. Bates; W. C. Severn; Brian G. Pazol; Anthony C. DeFranzo

doi:10.1117/12.130785

14 December 1992 80-mm EFG sapphire dome blanks yield high-quality low-cost single-crystal domes

John W. Locher, Herb E. Bates, W. C. Severn, Brian G. Pazol, Anthony C. DeFranzo

Proceedings Volume 1760, Window and Dome Technologies and Materials III; (1992) https://doi.org/10.1117/12.130785
Event: San Diego '92, 1992, San Diego, CA, United States

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.

Citation Download Citation

John W. Locher, Herb E. Bates, W. C. Severn, Brian G. Pazol, and Anthony C. DeFranzo "80-mm EFG sapphire dome blanks yield high-quality low-cost single-crystal domes", Proc. SPIE 1760, Window and Dome Technologies and Materials III, (14 December 1992); https://doi.org/10.1117/12.130785

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