A light coupling element is proposed with a surface (3) of a material
which
is transparent to light of a given wavelength (). In order for the light
coupling element to act independently of the direction of the vectorial parameters
of the light, such as in particular of the polarization, on the surface of the
light coupling element line-form indentations or elevations (51,
52) are provided which are equidistantly parallel and which intersect
at given angles ().
