The sapphire lens are very useful for applications in extreme environments. Sapphire’s high melting point makes it a great material for use in furnace and high power laser applications. Its extreme hardness and strength make it an excellent choice in dirty or high impact or high pressure situations.
Corrosion resistant surface
Radius of Curvature
Convex, Concave, Meniscus, in any measurement from flat to hemispherical