Optische Anordnung zur Symmetrisierung und/oder Homogenisierung optischer Strahlung

The present invention relates to an optical assembly for optically pumping an active medium (9), with which a symmetrization and/or homogenization of optical radiation of a light source used for pumping is achieved. The assembly comprises two imaging lenses (1, 2), which are arranged one behind the other such that a parallel beam of rays passing through the first imaging lens (1) forms a beam waist between the first (1) and the second imaging lens (2) and an angular distribution of the beam of rays is imaged in the region of the beam waist by the second imaging lens (2) on the focal plane (7) of the second imaging lens (2). In the region of the beam waist, an optical element (3) is located, which achieves a homogenization of the angular distribution of the radiation in front of the second imaging lens (2), in particular at least one micro lens array. Using the proposed assembly, symmetrization and/or homogenization of the angular distribution of the optical radiation is achieved behind the optical system such that a local homogeneity is not only achieved in the target plane, but also in the region behind the target plane.