Balls & balls measuring head jewels are made of synthetic sapphire/ruby. They are largely used in heavily corrosive environment and optical fiber communication because of its anticorrosion, wearable and fine transmission characteristics. Balls measuring head jewels are used as insulated measure head on precise instruments.
Sapphire windows are applied as circuit substrates, epitaxial substrates, substrates, oriented substrates to GaN, GaAs. And other, Sapphire possesses nice light transmission in 0.17 ~ 5.50 nm wave band, and the infrared ray transmission is hardly influenced by temperature, so the optical components made of sapphire are fully applied to military infrared equipment, observation window for high temperature furnaces, windows for counters, etc