HR coatings

Highly reflective coatings, also called HR coatings, can be realized in two ways; by applying a metal layer and by coating with dielectric layer systems. As dielectric layers have low absorption, reflectivities of up to 99.99 % can be achieved.

 

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Selective mirrors

A specific form of HR coatings is represented by selective mirrors which do not reflect over a broad spectral range but in narrow wavelength ranges, transmitting the remaining light. The spectral selection generated by these means can be applied to individual colours such as red, green or blue, to wavelength ranges for individual LED light sources and on to individual laser wavelengths.

 

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