Reflective coatings for astronomical telescopes can be costly increasing due to the size of the mirrors. Currently, the demands for uniform, defect-free, and coatings with great adhesion have increased, as new systems grow larger for a greater collection of light. Across the globe, in situ coaters are commonly used in large observatories to maintain the performance specifications of the mirrors.
The typical coating for telescope mirrors is a thin layer of aluminum, sometimes with one or a couple of dielectric layers to protect the metallic one. Other metals, such as Ag or Au can be used in special cases, e.g. infrared telescopes.
Polyteknik has experience with providing the design and manufacture of coater systems for astronomy. Our team has the capabilities of designing customized vacuum systems for the deposition of the layers of mirrors in different size ranges, up to several meters.