Variable Neutral Density Filter Filters
Featured Product from Daheng New Epoch Technology, Inc.
Circularly variable neutral density filters are designed to simplify attenuation and beamsplitting from VIS to near IR. The optical density gradually varies around a 270circle 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 availablewith 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.