18 May 2005 Producing large EFG sapphire sheet for VIS-IR (500-5000 nm) window applications
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Abstract
EFG sapphire sheet measuring 305 x 510mm and 225 x 660mm have been produced in quantity. The average optical transmission of 6.15 mm thick uncoated polished panels is 84.0% ± 0.5 at 700 nm. This value assures good transmission throughout the 500 to 5000 nm spectral range. Effective absorption coefficients for this spectral range and thickness are calculated and presented. An a verage index inhomogeneity of 6 ppm ± 2 has been measured and is the requirement for panels polished to 0.1λ at this thickness (@633 nm).
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John W. Locher, Herb E. Bates, Christopher D. Jones, Steven A. Zanella, "Producing large EFG sapphire sheet for VIS-IR (500-5000 nm) window applications", Proc. SPIE 5786, Window and Dome Technologies and Materials IX, (18 May 2005); doi: 10.1117/12.603843; https://doi.org/10.1117/12.603843
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