Absorption and particularly wavelength selective absorption is an
important factor in the function of the filters. The two most
commonly used absorbers are thin metallic films which are
particularly insensitive to wavelength for absorption and colored
glasses which absorb wavelengths varied by as much as several
orders of magnitudes in only tens of nanometers. Interference
filters are multilayer dielectric thin film devices. Metallic
films, colored glasses and thin dielectric films are used in
UNIORIENTAL filters
