DESIGN OF OPTICAL COATINGS FOR 2 WIDELY SEPARATED SPECTRAL REGIONS

A systematic method for the design of antireflection coatings for two widely separated spectral regions has been previously described. This method, based on the buffer layer concept, has been extended to the de sign of optical coatings with virtually any spectral characteristics i n the two regions. To demonstrate the principle, coatings with all pos sible combinations of the properties of antireflection coatings, neutr al filters, reflectors, edge filters and narrow-band filters in the vi sible and in the infrared spectral regions are presented.