18x36x1.5 inch sapphire panels for visible and infrared windows

Matthew Montgomery; Clark Blockburger

doi:10.1117/12.2269465

3 May 2017 18x36x1.5 inch sapphire panels for visible and infrared windows

Matthew Montgomery, Clark Blockburger

Proceedings Volume 10179, Window and Dome Technologies and Materials XV; 101790N (2017) https://doi.org/10.1117/12.2269465
Event: SPIE Defense + Security, 2017, Anaheim, CA, United States

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.

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Citation Download Citation

Matthew Montgomery and 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); https://doi.org/10.1117/12.2269465

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