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.