Optical and crystalline characteristics of large EFG sapphire sheet

摘要: 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. windows are subsequently assembled a multi-panel configuration for advanced targeting, navigation, reconnaissance applications. As future aerospace programs will require with larger apertures, material characteristics uniformity such refractive index homogeneity increase in importance. Optical measurements, x-ray topography data rocking curve analysis presented crystalline properties they relate to inhomogeneity wave front distortion discussed.