Patent ID: 8405898
Filing Date: 2013-03-26
Classification: G02B,G03H

Abstract:
1. 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 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.