II-VI, Inc. engages in the development, refinement, manufacturing, and marketing of engineered materials and opto-electronic components and devices for precision in the field of industrial materials processing, optical communications, aerospace and defense, consumer electronics, semiconductor capital equipment, life sciences, and automotive applications and markets. It operates through the following segments: Photonic Solutions and Compound Semiconductors. The Photonic Solutions segment manufactures crystal materials, optics, microchip lasers and optoelectronic modules for use in optical communication networks and other diverse consumer and commercial applications, pump lasers, optical isolators, and optical amplifiers and micro-optics for optical amplifiers, for both terrestrial and submarine applications within the optical communications market. The Compound Semiconductors segment designs, manufactures and markets optical and electro-optical components and materials, infrared optical components and high-precision optical assemblies for aerospace and defense, medical and commercial laser imaging applications, semiconductor lasers and detectors for optical interconnects and sensing applications, unique engineered materials for thermoelectric and silicon carbide applications servicing the semiconductor, aerospace and defense and medical markets. The company was founded Carl J. Johnson in 1971 and is headquartered in Saxonburg, PA.