The NRCC Fourier transform synthesis method has been applied for the first
time to an optical thin film design problem in which the external media are different.
Graded index AR coatings for germanium substrates have been synthesized and
compared to multilayer solutions. No limits have been imposed on the refractive
indices. Although such systems cannot be put into practice, they provide basic
insight into the general nature of broadband AR coatings. Admittance diagrams have
been calculated for some of the systems to gain further understanding of their
behavior.© (1990) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.