[1] F SCHMID, C P KHATTAK. Current status of sapphire technology for window and dome applications. Proceedings of SPIE-The International Society for Optical Engineering, 25(1989).

[4] M MONTGOMERY, C BLOCKBURGER. 18×36×1.5 inch sapphire panels for visible and infrared windows. Proceedings of SPIE Defense + Security, 1(2017).

[7] D H WANG, Y Y XUE, N LI et al. Micro-tube sapphire crystal grown by the edge-defined-film fed method. Journal of Inorganic Materials, 1290(2019).

[8] D H WANG, W T HOU, N LI et al. Defects and optical property of single-crystal sapphire fibers grown by edge-defined film-fed growth method. Journal of Inorganic Materials, 1053(2020).