... :+/-0.01mm 2.Angle tolerance:5''-3' 3.Materical:Bk7,K9.Si,Ge,Caf2,sapphire,Znse,GaAs,Zns Optical Windows We are ... to designing and making all kinds of optical components for customer special useMaterialBK7 etc optical glass to IR CaF2,MgF2,Ge,ZnSe,Mono ...