18 May 2005 Optical and crystalline characteristics of large EFG sapphire sheet
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Edge Defined Film-fed Growth (EFGTM) Saphikon® sapphire crystals have been grown as large, thick sheet. The sheet is then precision-polished and coated into an infrared or laser transmission compatible window. The sapphire windows are subsequently assembled into a multi-panel configuration for advanced targeting, navigation, or reconnaissance applications. As future aerospace programs will require windows with larger apertures, material characteristics and uniformity such as refractive index homogeneity will increase in importance. Optical measurements, x-ray topography data and rocking curve analysis are presented The crystalline properties as they relate to refractive index inhomogeneity and wave front distortion are discussed.
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Herbert E. Bates, Herbert E. Bates, Christopher D. Jones, Christopher D. Jones, John W. Locher, John W. Locher, } "Optical and crystalline characteristics of large EFG sapphire sheet", Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); doi: 10.1117/12.603944; https://doi.org/10.1117/12.603944

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