Variable neutral-density optical filter GCC-3030 series

BK7

Circularly variable neutral density filters are designed to simplify attenuation and beamsplitting from VIS to near IR. The optical density gradually varies around a 270 circle for convenient attenuation adjustment by simply rotating the filter. Attenuation is achieved by a thin Ni-Cr-Fe film, allowing these attenuators to withstand moderate laser energy as well as to act as variable beamsplitters. Circularly variable ND filters are available with BK7 substrates for general laboratory use, or with UV fused silica substrates for maximum thermal stability. Although the coatings are optimized for 400-700nm, they will operate from 400-1100nm with only minor losses. •Outside Diameter: φ50±0.25 •Center Hole Diameter: 8±0.25 •Clear Aperture: >80%dimeter •Linearity of Optical Density: ±5% at 632.8nm •Coating: S1:Ni-Cr-Fe S2:Broadband AR coated, Rave<0.5% for 420-675nm at 0-15º incidence.