Device with at least one beam source and an arrangement for geometric reshaping of the radiation field emitted by the beam source

Apparatus for geometric reshaping of a radiation beam, emitted by at least one radiation source, which propagates in a propagation direction along a z-direction and has a radiation cross section which, in one direction defined as an x-direction, extends perpendicular to the z-direction, and in a direction perpendicular to the x and z-directions, defined as a y-direction, exhibits a greater width with lower beam density,

• whereby x, y and z form a rectangular coordinate system,
• wherein the radiation beam is grouped in partial radiation components in the x-direction and the radiation components are re-oriented in relation to their beam cross sections,
• said apparatus comprising, in combination:
• (a) mirror array arranged to intercept the radiation beam and including several reflective elements, each element having a pair of planar reflection surfaces which are aligned with respect to each other and form an opening angle of substantially 90° which is directed opposite to the propagation direction, wherein each part of the radiation is double-reflected in each instance on the reflection surfaces assigned in pairs, and is rotated by said opening angle,
• wherein the individual pairs of reflection surfaces form a line of intersection between them oriented substantially 45° with respect to the x-direction and substantially 90° with respect to the z-direction, thus forming a continuous w-shaped surface structure, and
• (b) a polarization splitter disposed in the radiation beam between the radiation source and the mirror array,
• wherein, viewed in the direction of radiation propagation, the radiation beam is first incident on the polarization splitter and, after retro-reflection from the pairs of reflection surfaces of the mirror array, is brought back to the polarization splitter with a rotated polarization direction and is there decoupled.