Process for the adjustment of a laser light spot for the laser processing of work pieces and a laser device for the performance of the process

摘要

The invention relates to a process for the adjustment of a laser light spot of high intensity for the laser processing of work pieces as well as a laser device for performing the proposed process. The laser device comprises a laser emitting a laser beam and at least one focusing lens for converging the laser beam as well as an optical operating element for adjusting the beam diameter of the laser beam. The invention proposes to use as operating element a diffractive optical element that separates the laser beam emitted by the laser into partial laser beams, with the partial laser beams generated by the diffractive optical element being assembled to form a resulting laser beam that acts on the work piece. By means of a suitable design of the diffractive optical element it is possible to adjust, in particular enlarge, the diameter of the laser light spot as required.

主权项

1. A process for the adjustment of a laser light spot of high intensity for plastic welding of work pieces to be joined by means of a laser device comprising at least one laser emitting a laser beam and at least one focusing lens for converging the laser beam, as well as an optical operating element for adjusting the beam diameter of the laser beam, with the optical operating element configured as a diffractive optical element, the method comprising the steps of:
configuring the diffractive optical element as having a number of standard cells and arranging said standard cells side-by-side with or without spacing; arranging the diffractive optical element between the laser and the focusing lens; emitting an original laser beam and directing said laser beam to the diffractive optical element; separating the original laser beam into a bundle of partial laser beams that are directed towards the focusing lens; enlarging a diameter of the bundle of partial laser beams in relation to a diameter of the original laser beam and therewith a diameter of the laser light spot to a desired dimension at the work pieces by means of the diffractive optical element, in the focal plane and transversely to an extension direction of the focal plane; focusing the partial laser beams that are generated from the original laser beam by means of the focusing lens and directing said partial laser beams at the work pieces with overlaps and/or gaps of any shape; assembling the partial laser beams to form a total laser beam that acts on a single processing spot as a laser light spot of high intensity; and moving the total laser beam relative to the work pieces; wherein a number, a lateral distance and a diameter of the partial laser beams as well as a total diameter of the total laser beam is determined by the diffractive optical element.