II-VI Incorporated develops, refines, manufactures, and markets engineered materials and opto-electronic components and products worldwide. The company provides various precision infrared optical components, such as lenses, output couplers, windows, and mirrors for use in CO2 lasers; and one-micron laser components, including modular laser processing heads for fiber lasers, YAG lasers, and other one-micron laser systems, as well as fiber optic cables and modular beam systems. It offers near-infrared optics comprising waveplates, polarizers, lenses, prisms, and mirrors for visible and near-infrared applications; coated windows, which are used as debris shields in the industrial and medical laser aftermarkets; fiber and micro optics, optical components, and photonic crystal parts for optical communications; optical and photonic crystal parts for instrumentation and laser applications; diode pumped solid-state laser devices for optical instruments, display, and biotechnology; and components for UV filters used in early warning missile detection. In addition, it provides military infrared optics, including missile domes, electro-optical windows and subassemblies, imaging lenses, and other components; and visible and crystalline materials, such as calcium fluoride, barium fluoride, and fused silica. Further, the company offers material processing and refinement products, including selenium and tellurium metals, chemicals, and rare earth materials; thermoelectric modules (TEMs) comprising single-stage TEMs, micro TEMs, multi-stage TEMs, planar multi-stage TEMs, extended life thermocyclers, thermoelectric thermal reference sources, power generators, and thermoelectric assemblies; and silicon carbide products consisting of 6H-SiC semi-insulating and 4H-SiC semi-conducting poly-types. The company markets its products through a direct sales force, and representatives and distributors. II-VI Incorporated was founded in 1971 and is headquartered in Saxonburg, Pennsylvania.