Method for adjusting a laser light spot for laser processing of workpieces and laser assembly for carrying out the method

摘要

Adjusting a laser light spot (12) of high intensity for laser processing of workpieces (7), preferably for laser welding of plastic workpieces to be joined using a laser arrangement (1) with laser emitting at least a laser beam (6), at least one focusing lens (4) for converging the laser beam, and an optical active element for adjusting the beam diameter of the laser beam, comprises forming optical active element as a diffractive optical element, which decomposes the original laser beam in a radiation beam from laser beam part, which are directed onto the workpiece. Adjusting a laser light spot (12) of high intensity for laser processing of workpieces (7), preferably for laser welding of plastic workpieces, which are to be joined using a laser arrangement (1) with laser emitting at least a laser beam (6), at least one focusing lens (4) for converging the laser beam, and an optical active element for adjusting the beam diameter of the laser beam, comprises forming optical active element as a diffractive optical element, which decomposes the original laser beam in a radiation beam from laser beam part, which are directed onto the workpiece. The diameter of the laser light spot on the workpieces, preferably in the focal plane and transverse to the extending direction of the focal plane is increased compared to the diameter of the original laser beam during entry into the diffractive optical element to a desired dimension using the diffractive optical element, where the partial laser beams generated from original laser beam is directed with overlapping and/or gaps of any shape to the workpieces and to a total laser beam, which respectively acts on a single processing point. The number and the diameter of the partial laser beams and the overall diameter of the total laser beam are determined through the diffractive optical element. An independent claim is also included for a laser arrangement for laser processing of workpieces, where (a) the focusing lens produces the laser light spot of high intensity on the workpiece and the active element is formed as the diffractive optical element, which splits the original laser beam into a beam of partial laser beams, (b) partial laser beams generated by the diffractive optical element forms the resultant beam profile, which is directed onto the focal plane, (c) the diffractive optical element increases the diameter of the laser light spots on the work pieces, preferably in the focal plane and transverse to the extending direction of the focal plane, compared to the diameter of the original laser beam during entry into the diffractive optical element to the desired dimension, (d) the generated partial laser beams are brought together to the total laser beam, which exhibits overlapping and/or gaps of any form and respectively directed to the single processing point of the workpiece.