Neutral Density Filters
Used to attenuate, split, or combine beams in a wide range of irradiance ratios, with no significant dependence on wavelength. Absorptive: Broadband use, attenuation varies with wavelength; low power Metallic: Broadband use, uniform attenuation with wavelength; low power .Dielectric: Narrowband use, precise attenuation; high laser damage threshold.
a. Fixed ND Filters
b. Circular Variable ND Filters
c. Linear Variable ND Filter