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.

Previous Term: CMYK  Next Term: cobalt glass