Large-area sapphire windows

Richard L. Gentilman; Patrick Timothy McGuire; Daniel Fiore; Kim Ostreicher; Joel Askinazi

doi:10.1117/12.501435

26 September 2003 Large-area sapphire windows

Richard L. Gentilman, Patrick Timothy McGuire, Daniel Fiore, Kim Ostreicher, Joel Askinazi

Proceedings Volume 5078, Window and Dome Technologies VIII; (2003) https://doi.org/10.1117/12.501435
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

Large area sapphire windows have been fabricated by edge-bonding multiple panes. A 4-pane edge-bonded 320 x 410 x 7 mm sapphire window with excellent optical characteristics has been successfully finished. Two different bonding methods were used to build up the 4-pane window blank. Pairs of commercially available EFG sapphire panes were first bonded using a 1500°C bonding process. The bonded pairs were then joined using a 1100°C process. Bond strengths for the two methods are approximately 130 MPa (20 kpsi). Optical finishing was completed using standard methods for sapphire with no significant increase in finishing time caused by the bonds. There are no deleterious optical effects or visible optical distortion due to the bond lines. The edge bonding technology can now produce 600 x 600 mm flat window blanks. Conformal windows have also been produced using the edge bonding method. Very high bond strengths of 250 MPa (37 kpsi) have been attained on smaller samples using an optimized solid ceramic fillet.

Citation Download Citation

Richard L. Gentilman, Patrick Timothy McGuire, Daniel Fiore, Kim Ostreicher, and Joel Askinazi "Large-area sapphire windows", Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); https://doi.org/10.1117/12.501435

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