Meller Optics Inc.’s sapphire and spinel optical domes provide front-surface protection to electronic sensors and detectors in harsh aerospace and industrial environments. They feature 160° maximum included angles to extend the viewing angles of cameras, sensors, detectors and other devices, and they provide extreme physical protection in harsh environments. Able to withstand moving sand, dirt, water and chemicals, they can be custom-engineered with precise edge steps and profiles for mounting purposes. They provide up to 85% transmission uncoated in the ultraviolet to infrared, with up to 99% when antireflection-coated on two sides. They exhibit Moh 9 hardness (second only to diamond) and can be supplied with outer-diameter sizes of up to 101.6 mm, with surface finishes to 20-10 scratch-dig.