Abstract: What is described here is a system for as well as a method of geometric beam shaping of the beam profile of a light beam, comprising a first prism and a second prism optically transparent to the light beam, which prisms are so disposed in the optical path of he light beam in such a way that after the passage of the light beam through both prisms the beam profile of the light beam may be expanded or reduced in a direction orthogonal on its direction of propagation by a first factor, and by a second factor different from the first factor in a direction orthogonal on the first direction.