Integral calculation method of the efficiencies of laminar stratified gratings

摘要

We present an integral calculation method of the efficiencies of laminar stratified gratings. By stratified grating, we mean a medium whose opfical index varies with the depth. The calculation is applied to the Bragg-Fraunhofer optics recently developed for the X-UV optics. The results of the method are compared m modal or differential methods already implemented for lamellar multilayer amplimde gmtings.