Abstract: The association of a photoresist grating and a prism usually called `grism' by astronomers is studied in detail from the efficiency point of view with the differential theory of diffraction gratings. Starting from the grism equation, the blaze properties of echelette transmission gratings are studied in the visible region as functions of blaze angle and groove spacing. The influence of incidence is considered. The asymptotic case of echelle is also studied. A special solution for perfect blazing is given. !13
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