Patent ID: 8755116
Filing Date: 2014-06-17
Classification: G01N,G02B

Abstract:
1. An optical assembly having: a light source, which provides two optically different light components with essentially planar wavefronts on an optical axis, wherein the light components differ at least in their wavelength; an objective lens, which projects the two optically different light components into a projection space; and an optical component, which is arranged on the optical axis and has an aperture, through which the wavefronts of the two light components pass and, in mutually adjacent areas of the aperture, has a different structure along the optical axis with a different dispersion behavior n(λ), wherein both of the light components enter the optical component with essentially planar wavefronts, wherein the optical component causes phase shifts of the wavefronts of both of the light components, wherein the phase shift of the wavefronts of one light component has at least one step of at least one quarter of the wavelength of the one light component between the mutually adjacent areas of the aperture of different structure, and wherein the phase shift of the wavefronts of the other light component is constant as it passes through the optical component over the aperture, such that an intensity distribution of the one light component in the projection space by mutual interference differs from an intensity distribution of the other light component in the projection space.