3 May 2017 18x36x1.5 inch sapphire panels for visible and infrared windows
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Abstract
158 kg sapphire single crystals were grown by horizontal directional solidification method. Bubble-free panels with usable rectangular dimensions of 457 mm x 914 mm x 38 mm (18 x 36 x 1.5 inches) can be cut from the crystals. These are the largest-area sapphire panels ever produced by any technique. Bubble-free sections of the crystal 300 mm x 457 mm and up to 60 mm thick (12 x 18 x 2.36 inches) can also be produced. Growths were performed with graphite heating elements under a controlled atmosphere with automated power control. Results of transmission measurements performed on 5 mm thick samples are presented and the transmission is similar to sapphire grown by other techniques.
Conference Presentation
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Matthew Montgomery, Matthew Montgomery, Clark Blockburger, Clark Blockburger, } "18x36x1.5 inch sapphire panels for visible and infrared windows", Proc. SPIE 10179, Window and Dome Technologies and Materials XV, 101790N (3 May 2017); doi: 10.1117/12.2269465; https://doi.org/10.1117/12.2269465
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