Device for Correcting the Wavelength Dependence in Diffraction-Based Optical Systems

Device for correcting the wavelength dependence in diffraction-based optical systems, in which a filtering of certain diffraction orders is provided, said device comprising:

• at least one diffractive optical light modulator having controllable structures;
• at least one light source for illuminating the light modulator;
• and
• a refractive focussing optical system;
• where corresponding wavelength-dependent diffraction orders are generated which exhibit a wavelength-dependent lateral chromatic offset, related to the surface normal of the light modulator, of the position of their different extents in a filtering plane which is defined by the focal length of a subsequent optical system, wherein the diffractive light modulator is followed by the refractive focussing optical system 30, 31) whose chromatic properties regarding the wavelength-dependent diffraction orders of the same ordinal number are adapted to the chromatic diffraction of the same diffraction orders of the same ordinal number of the light modulator, where in a given filtering plane behind the refractive focussing optical system the diffraction orders of the same ordinal number and of different wavelengths (red, green, blue) overlap as concentrically as possible.