Mouchart J
Appl Opt. 1977 Nov 1;16(11):3001-8. doi: 10.1364/AO.16.003001.
This paper considers the conditions for obtaining an antireflection coating for two distinct wavelengths. Particular attention is paid to two- or three-layer coatings, and the paper explains the relations linking the indices with each other to obtain this result. The example of coatings adapted to a substrate with an index of 1.52 is quoted.