Arrangement for shaping a laser beam and for reducing the coherence thereof

摘要

The invention is directed to an arrangement for shaping a laser beam and for reducing the coherence thereof. The arrangement has at least two approximately parallel mirrors arranged approximately perpendicular to the laser beam. One of the mirrors is fully reflective whereas the other mirror is partially reflective so that the exiting light beam comprises several mutually adjacent or partially overlapping component beams which are reflected a different number of times. The spacing of the mirrors is greater than half the coherence length of the laser. An advantageous embodiment provides the arrangement on a plane-parallel glass plate with the degree of reflection of the partially-reflective mirror being reduced in a stepwise manner and with a partial overlapping of the exiting component beams.