Light coupling-element, method to realize a polarization-independence and method to reduce the drop-size on the light coupling-element with surface-grids

A light coupling element is with a surface (3) made from a material, which is transparent for light of a given wavelength lambda. Thus the light coupling-element works independent of the direction of the vector-size of the light, especially the polarization, line-formed in- or out-forms-strips (51, 52) are provided on the surface of the light coupling-element, said forms are equidistant and parallel, and they cross one another under a given angle (phi).