High Vacuum Laboratory PEVIN

Antireflection Coatings

In numerous optical systems, from spectacles through camera lenses to optical instrumentation, one of the essential components is the antireflection (AR) coating on lens. For many applications such coatings are indispensable. Without  them the performance of modern optical systems could not be achieved. Our laboratory offers 1-layer, 2-layer  and multilayer AR coatings. We can design it for VIS, UV and IR area.  We can coat glass as well plastics with different refractive index.
Simple 1-layer coatings are made of materials with low refractive index, most often magnesium fluoride. These kind of thin films are very popular thanks to  their optical and mechanical properties of this evaporation material. Unfortunately  average reflection coefficient of  typical glass (n=1.5)  with MgF2 AR coating  is only about 2% (for uncoated  glass 4.1%) and minimum achieves – 1.33%. Below there are reflection curves of 1-layer coatings made in our laboratory  on different  types of glass: B270 (n=1.5) and SF2 (n=1.6).


2-layer AR coatings have a minimum of reflection coefficient on a level about 0.1% (glass BK270, n=1.5). Average reflection coefficient of AR coating designed for visible light is about 1%. These values are sufficient for more optical systems.


Multilayer  coatings are mostly used in optical systems which need excellent optical parameters for wide range of wavelength of light. These coatings for visible light have average reflection coefficient about 0.5%.  Below is shown the reflection curve of
3-layer coating on glass B270 made in our laboratory.