Arrangement for spectrally filtering or beam-splitting with a gradient color filter

The invention relates to an arrangement for spectrally filtering an optical beam with a gradient color filter (4). to find the object of the invention to provide a new possibility for spectrally filtering by means of a gradient color filter (4), which has an improved edge steepness for real optical beam is achieved according to the invention by using a beam shaping optics (2) is present, the extension of the on the course of color filter (4) the incident beam (3) decreases in the running direction (41) and in the transverse direction of the course of color filter (4) is increased, wherein a cross sectional area (A2) of the course of color filter incident (4) the beam (3) is adapted such that it has a spectral target resolution at a present edge steepness in the running direction (41) of the course of color filter (4) and at least 3/4 of the cross-sectional area (A1) of the incident beam (1) is reached.