26 September 2003 The production of 225 x 325 mm sapphire windows for IR (1 to 5 μm) applications
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Edge Defined film Fed Growth (EFG) SaphikonTM sapphire crystals have been grown and successfully processed into windows measuring 225 x 325 mm with a thickness of 5.6 mm. More than 40 windows have been completed and assembled into customer hardware and delivered. The polished and coated windows have exhibited average transmission >93% from 1 to 5 mm and wavefront measurements of <0.1 waves rms (@ 0.633 μm) over a 125 mm aperture. Optical measurement data are presented and aspects of the crystal growth and polishing processes are discussed.
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John W. Locher, John W. Locher, Herbert E. Bates, Herbert E. Bates, Steven A. Zanella, Steven A. Zanella, Evan C. Lundstedt, Evan C. Lundstedt, Charles T. Warner, Charles T. Warner, } "The production of 225 x 325 mm sapphire windows for IR (1 to 5 μm) applications", Proc. SPIE 5078, Window and Dome Technologies VIII, (26 September 2003); doi: 10.1117/12.485701; https://doi.org/10.1117/12.485701

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