Coupletech Co., Ltd., manufactures, develops and markets a variety of optical crystals and devices which are widely used in the field of optoelectronics, Coupletech product line consists of laser crystals including ND: YVO4, Diffusion Bonded Composite Crystal, ND: YLF, Cr: YAG, etc.; Nonlinear optical ( NLO ) crystals, including KTP, KTA, BIBO, LBO, BBO, DKDP, KDP crystal, etc.; Fluoride crystals including CaF2, BaF2, MgF2; Crystal devices including DKDP Q-Switch, LN Q-Switch, BBO Q-Switch; Optical Elements including various Optical Windows, prism, mirrors and lenses. We combine high volume purchasing and in-house manufacturing to supply our products at the most attractive price. We put customers in first place and do the best to continue improving our product quality and technology to win and maintain the reputations in the optical industry. We have strict quality control system and we are able to meet all of our customers` requirements in the optical industry, we have been paying much attention to the after-sales services and thinking that these services are important and value-added measures to the customers. In addition there are our specialist teams who provide services to customers in the fields of optical design, system engineering, quality assurance and system manufacturing. And, last but not least, as the basis of a good supplier relationship we strive to be a reliable, competent and longstanding partner to our customers.