11 May 2009 Characteristics of thick (>12 mm) Class225 EFG sapphire sheet for IR window applications
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Demand for larger aperture sapphire IR windows is increasing. To withstand the higher dynamic and pressure forces exerted on them these larger windows require thicker material. Edge Defined Film-fed Growth (EFG)TM Sapphire crystals have traditionally been grown with a thickness of ≤ 11 mm, then finished and polished to a nominal thickness of 5.5 mm. We present optical characteristics data here for Class225(R) EFGTM sapphire sheet that is being grown up to 22 mm thick and finished at 16.8 mm.
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John Locher, John Locher, Christopher Jones, Christopher Jones, Herbert Bates, Herbert Bates, Jeffrey Rioux, Jeffrey Rioux, } "Characteristics of thick (>12 mm) Class225 EFG sapphire sheet for IR window applications", Proc. SPIE 7302, Window and Dome Technologies and Materials XI, 730203 (11 May 2009); doi: 10.1117/12.818020; https://doi.org/10.1117/12.818020

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