Flat-topped broadband rugate filters.
A method of creating rugate interference filters that have flat-topped reflectance across an extended spectral region is presented. The method applies known relations from the classical coupled wave theory to develop a set of equations that gives the spatial frequency distribution of rugate cycles to achieve constant reflectance across a given spectral region. Two examples of the application of this method are discussed: a highly reflective coating for eye protection against harmful laser radiation incident from normal to 45 degrees , and a spectral beam splitter for efficient solar power conversion.
Imenes
Anne G
AG
School of Physics, The University of Sydney, New South Wales, Australia. anne.imenes@csiro.au
McKenzie
David R
DR