CASTECH INC. (CASTECH) is founded by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences) in 1988, is a world famous manufacturer of crystals for lasers and their applications. It is devoted to the development, manufacturing and marketing of a wide range of NLO, laser, birefringent, Electro-Optics as well as optical crystals. The emphasis is targeted on those crystals that are the most important in current and future applications in laser technology. After twenty years untiring efforts, CASTECH become the leading supplier for LBO, BBO, Nd:YVO4 and Nd:YVO4+KTP glued crystal in the world. We developed flux, Czochralski and water solution crystal growing technique. We have IAD,IBS and EB coating technique to meet different requirement. Today, over 90% of CASTECH's product are exported to USA, Japan, Germany and other European, Asian Market. We have spread our sales network all over the world. Especially in the main industrial countries and districts, CASTECH has set up its own agency and sales branches. CASTECH, based on its credo of "comity, positive, sureness and innovation", will never stop its steps toward the target of "The Best Global Supplier for Non-linear Optical Crystal and Laser Crystal".