ND4 attenuation filter

ND4 neutral gray-scale filter is also called dimming sheet, dimming mirror, nd sheet, neutral density gray-scale mirror, medium gray mirror, gray glass, attenuation sheet. The neutral density attenuation filter uses the absorption or reflection characteristics of substances to attenuate the light intensity. After the light from the visible light area to the near-infrared light area passes through the neutral density filter, different waves attenuate in the same proportion, Make the optical element maintain approximately equal light energy transmittance in the wide band.
1% filter
Technical parameters
Items Parameters
Product index customizable
Size range 10-100mm
Thickness 2 ± 0.1mm
Density tolerance ± 2%
Luminous aperture > 90%
Materials green plate glass, K9 glass, fused quartz
Attenuation band (1) UV (ultraviolet band): 250nm~380nm, attenuation 20%, 50%; (2) VIS (visible light band): 400nm~700nm attenuation: 99%, 90%, 80%, 70%, 50%, 30%, 20%, 10%; (3) Vis+NIR (visible band and near infrared band): 400nm~1000nm; (4) Optical communication band: 1200nm, 1310nm, 1550nm, transmittance after attenuation 70%, 20%, 50%, 1%, etc.
spectral curve

In addition, We can customize the optical filters according to customer requirements or drawings.

For details, please consult:

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