Optical coatings play a significant role in medical technology whether in research, in diagnostics or in therapy. It is largely irrelevant in this case whether we are talking about a simple dental mirror, endoscopes, lasers for dental or ophthalmology applications or spectrometers - all of these products demand compliance with strict medical technology specifications. This applies in particular to the coatings required by these applications which have to withstand special conditions, such as sterilization and contact with organic substances, for example.