Fujian Castech Crystals, Inc. (CASTECH) was initiated by the Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, in 1988. CASTECH is a customer-driven organization distinguished from its competition by a commitment to excellence and the quality of its products and services. This commitment, fully backed by world-class R & D capabilities of the Fujian Institute, particularly in the area of advanced nonlinear optical materials and devices, ensures long term benefits to our customers when they buy products from CASTECH