... :5''-3' 3.Materical:Bk7,K9.Si,Ge,Caf2,sapphire,Znse,GaAs,Zns Optical Windows We are fully committed to designing and ... etc optical glass to IR CaF2,MgF2,Ge,ZnSe,Mono Si,ZnS,quartz, Sapphire,etc crystal materials. SizeΦ2 –Φ120mmDimension tolerance ...