About us Shandong Yanggu Constant Crystal Optics,Inc was founded in 2006 , is the professional manufacturer for optical components and crystal components .We have 1000 square meters Non-dusty workshop ,advanced manufacturing lines and full series of equipments .We have bulit and keep enhancing the ability of responding to customer demand reapidly and developing ground-breaking products accordingly Our products and service Optical components : optical material , optical blanks ,window ,prism,lens,filter ,beamsplitter ,waveplate ,wedge and mirror Crystal components : laser crystal ,Nonliner crystal ,Birefringent crystal ,Acousto & electro crystal Coating : Anti-Reflective coating ,High reflective coating , Interference coating , Dichroic coating and etc Customized service : We have a experienced R&D team, so we can offer the customized projects base customers' request Quality ensure : We have established complete quality ensure system , including strict testing policy and full series of high precision testing equipments .Our quality ensure system has been certified by ISO9001:2008