coated optics

Definition: Lens elements of optical system whose refracting surfaces are evenly covered with one or more extremely thin layers of material. * These layers improve transmission of incident light i.e. they serve to reduce losses from reflection. * Some types of coating also used to protect the surfaces or prevent fogging by moisture condensation. * Materials used include: magnesium fluoride, silicon oxide, zinc sulphide which are deposited using using vapour or electron beam methods.

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