CASTECH Inc. engages in the research and development, production, and sale of crystal components, precision optical components, and laser devices primarily in China. The company offers NLO, laser, magneto-optical, birefringent, AO and EO, and scintillation crystals, as well as oven and temperature controller accessories; and precision optics, including coatings, windows, mirrors, prisms, spherical lenses, aspherical lenses, cylindrical lenses, waveplates, polarizers, beamsplitters, diffraction gratings, and featured optics. It also provides laser components, such as magneto-optic, acousto-optic, electro-optic, drivers, photoelastic modulators, optical fiber transmission devices, optical systems and swtiches, optical lenses, and laser material processing optics. The company's products are mainly used in the manufacture of solid-state lasers and fiber lasers; and optical communications, AR, lidar, semiconductor equipment, optical testing equipment, analytical instruments, life sciences and scientific research, and other fields. It also exports its products to North America, Europe, Japan, and other Asian countries. In addition, the company engages in the manufacturing and sale of optoelectronic components and optics crystal materials; investment in manufacturing; information transmission; software and information technology, as well as scientific research and technical services. CASTECH Inc. was founded in 1988 and is based in Fuzhou, China.