... special polished products can be made of materials such as BK7, Fused Silica, sapphire and so on.IPL filters are the ... , 645 ∼ 1200, 695 ∼ 1200, 755 ∼ 1200, 780 ∼ 1200 nm AttributeSpecificationMaterialBK7, K9, Fused Silica, etc.Typical Diameter (mm)≥2.0mmDiameter Tolerance (mm ...