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Abstract
A simple and fast method of designing ripple-free, broad-band, thinfilm edge filters is presented. It uses a successive refinement procedure for ripple reduction without any special merit functions, and a fast computational algorithm for finding the derivative of reflectance. The design of cyan and yellow broad-band edge filters is taken as an example to illustrate the procedure. The influence of various parameters in the ripple reduction process is analysed. The choice of these parameters at various stages of refinement to obtain a fast-converging solution is indicated. The effect of practical errors in controlling the thickness of the layers on the final product is also studied. The method illustrated here can readily be used for the design of any broad-band edge filter and may be extended for other types of multilayer filter.