Giving to CREOL CREOL, The College of Optics & Photonics

Seminar: "Development in EFG sapphire at II-VI Optical Systems" by Melissa Seitz

Tuesday, June 5, 2018 12:00 PM to 1:00 PM
CREOL Room A214


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.


Melissa Seitz is a Materials Engineer at II-VI Optical Systems. She graduated from the University of Arizona in 2010 with a degree in Optical Sciences and Engineering with emphasis in Material Science and Mathematics. In her current position, she supports crystal growth initiatives, specifically germanium and sapphire crystal growth, and has been the primary lead for all material evaluations and qualifications at the company for the last several years.

For additional information:

Kathleen Richardson

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