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1. (WO2018162356) METHOD AND DEVICE FOR SHAPING RADIATION FOR LASER PROCESSING

Pub. No.:    WO/2018/162356    International Application No.:    PCT/EP2018/055206
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Sat Mar 03 00:59:59 CET 2018
IPC: H01S 3/00
G02B 27/48
B23K 26/06
Applicants: ROBERT BOSCH GMBH
Inventors: MIKHAYLOV, Dmitriy
GAUCH, Roland
GRAF, Tobias
Title: METHOD AND DEVICE FOR SHAPING RADIATION FOR LASER PROCESSING
Abstract:
The invention relates to a method and a laser assembly for material processing, wherein, in a laser assembly, a laser beam is focused onto a processing/imaging plane and the laser beam can be adapted in terms of its intensity distribution by means of at least one beam shaper. In addition, in order to prevent uniformity errors in the processing/imaging plane the laser beam is divided into at least two sub- or individual beams by means of at least one beam divider, and the sub- or individual beams are differently influenced or each sub- or individual beam is formed from a laser source with different wavelengths in such a way that they form an output beam with an intensity profile after the aggregation and focusing thereof onto the processing/imaging plane, wherein neighbouring intensity maxima of the intensity profile differ in terms of their light properties. In this way, the formation of disturbing interferences can be prevented, such that disturbing speckle patterns are substantially eliminated, whereby the quality of the beam shape can be significantly improved, in particular for laser processing processes.