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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 Dream
Lasers filters.
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