Diffractive gratings with varying period’s shape

Abstract

The aim of this short review is to recall various designs of diffraction gratings when the condition of the period’s identity is relaxed and to mention resulting thus some of their applications. Among others the apodization function can be implemented as a variable diffraction efficiency due to the gradual change of the period’s shape. Another possible application is the passive achromatization of the diffraction efficiency of the blazed gratings by randomizing their blaze angle.

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