Abstract: In a method for manufacturing a blazed grating from a prefabricated initial blazed grating, a blazed grating the substrate of a first material of which has a surface, which has an initial surface profile having an initial blaze angle, is provided. An auxiliary layer of a second material is applied onto the surface of the substrate, wherein the second material is different from the first material. The auxiliary layer is removed at least partially by means of etching, wherein the etching is carried out at least until the etching simultaneously acts on the auxiliary layer and on the initial surface profile of the substrate. A ratio between an etching rate for the auxiliary layer and an etching rate for the substrate is adjusted such that the initial blaze angle is reduced to a final blaze angle. Further, a blazed grating manufactured in that way and an optical device having such a blazed grating, are described.

Abstract: The invention relates to an optical system wherein a masking arrangement removes a component region from an overall region to be viewed while minimizing stray radiation. The improvement afforded by the optical system of the invention is provided by two measures which augment each other in an advantageous manner. The first measure is the use of a component masking arrangement wherein the masked out component region is directed onto a mirror. The second measure is provided by focusing the entering beam with a mirror onto the masking arrangement for masking out the component region. With the controlled removal of the component region, the masked out component region as well as the remaining region can be viewed simultaneously. After an intensity adaptation of one region, which can be carried out if required, both regions can be joined again to a total region.