Device for Minimizing Diffraction-Related Dispersion in Spatial Light Modulators

Device for the minimisation of diffraction-related dispersion in light modulators for the holographic reconstruction of colour scenes, comprising a light modulator in the form of a diffractive optical element with controllable structures, and at least one light source for the illumination of the light modulator, where corresponding wavelength-dependent visibility regions related to a given higher diffraction order exhibit a lateral chromatic offset, related to the surface normal of the light modulator, as regards the position of the dimensions of these visibility regions in a given observer plane wherein the light modulator is combined with at least one refractive optical element, whose refractive chromatic dispersion |dδ/dλ| is equal to the diffractive chromatic dispersion |dθ/dλ| of the pixel-based light modulator, according to the equation

• |dδ/dλ|=|dθ/dλ|
• where the refractive optical element exhibits such refractive chromatic dispersion |dδ/dλ| with an opposing effective direction that the wavelength-dependent visibility regions with their dimensions are centred on an effective visibility region with a dimension in the specified observer plane, where δ is the deflection angle of the refractive optical element, θ is the diffraction angle and λ is the wavelength.