Neutral Density Filter, Circular Variable Metallic, UVFS, 25 mm, 0-4 OD

The 25FS04DV.4 is a circular variable metallic neutral density filter, made of UV grade Fused Silica, 25 mm in diameter, and coated for an OD range of 0-4.0.

Newport’s Circular Variable Neutral Density Filter is designed to attenuate the wide spectrum of low energy laser light from UV to near IR wavelength. The optical density gradient varies from 0–1.0, 0-2.0 and 0-4.0 around a by simply rotating the filter from 0 to 270 degrees. Fused silica substrate for these ND filters allows the transparency from 250-2500 nm range. The linear change in optical density is achieved by fine Inconel coating that allows the controlled linear attenuation of light beam in the designated optical density range for wide spectrum of light.