Abstract
Fluids adsorbed within the layers of optical coatings cause gradients of refractive index which scatter light from the reflected and transmitted beams. A general equation which relates the sensitivity to scatter to the strength of the electric field at a point in a coating is derived and used to obtain approximate expressions for the magnitude of scatter expected from antireflection films, multilayered reflecting coatings, and interference filters. Examples of scatter from all-dielectric and metal–dielectric–metal filters are given, and the time-dependence and tuning characteristics of the scatter are discussed.
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