SCHOTT supplies standard and custom-made interference filters within the spectral range from 200 nm to 2000 nm. Development and production according to customers’ specifications comprise the greatest part of our business. We use the high vacuum evaporation process (PVD) to coat substrates. Ion assisted deposition processes, such as the reactive ion plating process, lead to very hard and compact thin films. As a consequence, these interference filters exhibit excellent climatic resistance and have very stable spectral characteristics with respect to temperature and humidity changes.