Colored optical filter

neutral-densityBK7fused silica

ND（Neutral Density） filters include absorptive and reflective filters，which are used in attenuating lasers and other optical signals. Absorptive filters minimize back reflections, which can be reduced further by adding an antireflection coating to the filter. Reflective filters are available with either a BK7 or UV Fused Silica substrate. Product Description Specifications: Materials: Colored Gray Glass Diameter Tolerance: +/-0.20mm Thickness: 0.5-3.0 mm Parallelism 85% Optical Density Tolerance: +/-5% Coating: Specified by customers