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Proceedings Paper

Large-area sapphire windows
Author(s): Richard L. Gentilman; Patrick Timothy McGuire; Daniel Fiore; Kim Ostreicher; Joel Askinazi
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Paper 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.

Paper Details

Date Published: 26 September 2003
PDF: 7 pages
Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.501435
Show Author Affiliations
Richard L. Gentilman, Materials Systems, Inc. (United States)
Patrick Timothy McGuire, Materials Systems, Inc. (United States)
Daniel Fiore, Materials Systems, Inc. (United States)
Kim Ostreicher, Materials Systems, Inc. (United States)
Joel Askinazi, Goodrich Corp. (United States)

Published in SPIE Proceedings Vol. 5078:
Window and Dome Technologies VIII
Randal W. Tustison, Editor(s)

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