II-VI Inc
II-VI may refer to: * II-VI Incorporated, a manufacturer of optical materials and semiconductors * II-VI semiconductor compound II-VI semiconductor compounds are compounds composed of a metal from either group 2 or 12 of the periodic table (the alkaline earth metals and group 12 element Group 12, by modern IUPAC numbering, is a group of chemical elements in the periodic ...

II-VI Incorporated
Coherent Corp. (formerly II-VI Incorporated) is an American manufacturer of optical materials and semiconductors. As of 2021, the company had 22,961 employees. Their stock is listed at Nasdaq under the ticker symbol COHR. In 2022, II-VI acquired laser manufacturer Coherent, Inc., and adopted its name. History Coherent was founded as II-VI Incorporated in 1971 by Carl Johnson and James Hawkey. The name "II-VI" is a reference to the groups II and VI in the periodic table, since the company started its business by producing cadmium telluride (cadmium belongs to group II and tellurium belongs to group VI). The company's first products included lenses, windows, and mirrors for CO lasers. The company held its initial public offering in 1987. According to Carl Johnson, the funds raised by the IPO allowed II-VI to expand its zinc selenide manufacturing capacity. In the 1990s, the company began to grow both on its own and through acquisitions. It purchased Litton Systems' silic ...
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