25 October 2000 Large-area flat and curved sapphire window blanks
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Abstract
With the objective of producing affordable large area windows, high strength edge bonds between individual sapphire components have been developed. Several bonding methods have been demonstrated, with bond fracture strengths ranging from 100 - 200 MPa. The directed energy process, which yields the strongest bonds, has produced bonded sapphire components 600 mm long and 3 mm thick with a 75 mm wide bond line. When polished, the bonded windows show no degradation in transmittance or transmitted wavefront quality. The processes have recently been scaled up to 355 m wide, 10 mm thick bonds lines and multipane window blanks. In addition, doubly-curved bonded sapphire components have been produced and polished with excellent results, using singly curved sapphire components for the individual panes. The edge bonding approaches shows promise for fabricating affordable sapphire windows up to 750 mm diameter.
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Brian G. Pazol, Patrick Timothy McGuire, Richard L. Gentilman, John W. Locher, Joel Askinazi, "Large-area flat and curved sapphire window blanks", Proc. SPIE 4102, Inorganic Optical Materials II, (25 October 2000); doi: 10.1117/12.405304; https://doi.org/10.1117/12.405304
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