Thin-film filter glasses and goggles with specialized dielectric thin film coating provide maximum viewing with excellent protection. Dielectric thin film coating is a high-reflectance coating consisting of alternating layers of quarter-wave film of a higher refractive index and lower refractive index than the substrate. Such coatings can be made very specific to a reflected wavelength or, by varying the layers' thicknesses or film indexes, spread over a wide wavelength interval. |
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