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Proceedings Paper

Development in EFG sapphire at II-VI Optical Systems
Author(s): M. Seitz; G. Peterson
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Paper Abstract

Large sapphire crystals are currently being grown at II-VI Optical Systems with dimensions of approximately 12” x 36” x 0.300” thick via an Edge Defined Film Fed Growth (EFG) method. These crystals are being used to make large sapphire windows for aerospace applications which require high strength and optical performance in the visible to mid-wave infrared regions. In the following paper, II-VI OS will present material data for their EFG sapphire and compare it to that for sapphire grown via the HEM approach, a method which is also used at II-VI OS. Reported data includes index homogeneity evaluated over the entire grown crystal. Other properties to be presented are equibiaxial flexural strength, index of refraction, Knoop hardness, thermal expansion coefficient and modulus of elasticity. The results presented herein will demonstrate that the material performance of sapphire grown at II-VI OS by either method is entirely comparable.

Paper Details

Date Published: 8 May 2018
PDF: 6 pages
Proc. SPIE 10627, Advanced Optics for Defense Applications: UV through LWIR III, 106270M (8 May 2018); doi: 10.1117/12.2305159
Show Author Affiliations
M. Seitz, II-VI Optical Systems (United States)
G. Peterson, II-VI Optical Systems (United States)

Published in SPIE Proceedings Vol. 10627:
Advanced Optics for Defense Applications: UV through LWIR III
Jay N. Vizgaitis; Bjørn F. Andresen; Peter L. Marasco; Jasbinder S. Sanghera; Miguel P. Snyder, Editor(s)

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