Heat-permeable cold mirror reflectors are used instead of heat-reflecting mirrors if it is necessary to improve dissipation of the infrared radiation fractions by means of transmission.
UV cold mirror reflectors are characterized by a high degree of narrow-band or broad-band reflection in the UV range from 200 nm to 400 nm; the visible and infrared light which is not welcome in many processes is transmitted or absorbed. Cold mirror reflector layer systems can be applied to glass, quartz or aluminium profiles and have an extra IR absorber layer added.
Applying a layer system of this kind, to a cooled aluminium profile, for example, makes it possible to filter out the undesired fractions of the spectrum highly efficiently and to dissipate this heat via the aluminium. In this way, only the desired UV radiation is still reflected - even at outputs in the multi-kilowatt range.