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.