Patent DE-102008033358-A1 (DE)
Title: Production of laser beam for surface processing, comprises emitting the laser beam with first beam parameter product from laser beam source and then deforming into laser beam with predeterminable beam parameter product via optical unit
Inventor: SCHWENGER LUDWIG
IPC: G02B27/09
Filed: 2008-07-16
Abstract: The method of producing a laser beam for surface processing, comprises emitting the laser beam with a first beam parameter product from a laser beam source and then deforming into a laser beam with a predeterminable beam parameter product via an optical unit, where the beam parameter product is less than or equal to the predeterminable beam parameter product; the beam parameter product in x-segment is not equal to the predeterminable beam parameter product in x-segment; and the beam parameter product in y-segment is not equal to the predeterminable beam parameter product in y-segment. The method for the production of a laser beam for surface processing, comprises emitting the laser beam with a first beam parameter product from a laser beam source and then deforming into a laser beam with the predeterminable beam parameter product via an optical unit, where the beam parameter product is less than or equal to the predeterminable beam parameter product; the beam parameter product in x-segment is not equal to the predeterminable beam parameter product in x-segment; the beam parameter product in y-segment is not equal to the predeterminable beam parameter product in y-segment; and all the products are orthogonal components. The laser beam has a beam cross section segmented into two segments, which are rhombic or rectangular, or represent disjoint surface of an ellipse with straight cut edges. The two segments correspond to the beam cross sections of two partial beams produced from the laser beam, where the partial beams are spatially separated from each other. The two segments are subjected to a transformation relevant to the spatial relative position, shape and/or size of the segments. The transformation is carried out in the frame of a reflection, a rotation and/or a lateral shifting by optical functional elements such as optical lenses, diffractive optical elements, curved or plane mirrors or prisms. The two transformed segments are joined to single deformed laser beam. The laser beam emitted by the laser beam source and/or the laser beam having the predeterminable beam parameter product are subjected to an optical stretching or compression in two orthogonal directions with respect to beam cross section. The two partial beams have a longitudinal beam cross section with a longitudinal extension and two lateral flank areas limiting the longitudinal beam cross section on both sides. The two partial beams are joined along their lateral flank areas under formation of an uniform, longitudinal laser beam or are joined under formation of a laser beam in the beam cross section in a stepped manner, where the beam cross sections of the partial beams are parallely directed with respect to respective longitudinal extension, or are arranged to each other in such a manner that the cross-sectional centre of gravity associated with the beam cross sections lies on a common connecting axis. The longitudinal beam cross sections are bent along their longitudinal extension around a uniform angle alpha of 0-90[deg] . An independent claim is included for a device for the production of a laser beam with a predeterminable beam parameter product.