Sapphire Window Sapphire Windows made by A-Star Optics in Fuzhou, China. Our sapphire windows are considered the best in the optical industry. Sapphire Window is made from Sapphire material at any size are available. Besides round, Sapphire windows at shape of quadrate, triangular, or other polygonal are available. Sapphire Window Specifications:  Attribute General High Precision … Continue reading Sapphire Window