US 12,235,462 B2
Optical arrangement and laser system
Thomas Zeller, Sindelfingen (DE); Christoph Tillkorn, Villingendorf (DE); Julian Hellstern, Rottweil (DE); Andreas Heimes, Renningen (DE); Christian Lingel, Kernen im Remstal (DE); Christoph Irion, Stuttgart (DE); and Michael Jenne, Ditzingen (DE)
Assigned to TRUMPF LASER-UND SYSTEMTECHNIK GMBH, Ditzingen (DE)
Filed by TRUMPF Laser- und Systemtechnik GmbH, Ditzingen (DE)
Filed on Sep. 30, 2022, as Appl. No. 17/956,843.
Application 17/956,843 is a continuation of application No. PCT/EP2021/058130, filed on Mar. 29, 2021.
Claims priority of application No. 10 2020 108 648.2 (DE), filed on Mar. 30, 2020.
Prior Publication US 2023/0027190 A1, Jan. 26, 2023
Int. Cl. G02B 27/09 (2006.01)
CPC G02B 27/0916 (2013.01) [G02B 27/0927 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical arrangement for converting at least one input laser beam into a line-type output beam, which propagates along a propagation direction and which has, in a working plane, a line-type beam cross-section that extends along a line direction with a non-vanishing intensity, the optical arrangement comprising:
a reshaping optical unit having an input aperture through which the at least one input laser beam is capable of being radiated in, and an elongate output aperture, wherein the reshaping optical unit is configured such that the input laser beam radiated in through the input aperture is converted into a beam packet having a multiplicity of beam segments that emerge through the output aperture, wherein adjacent beam segments of the input laser beam, when passing through the reshaping optical unit, are rearranged into the multiplicity of beam segments of the beam packet, wherein adjacent beam segments of the beam packet have traveled along optical path lengths when passing through the reshaping optical unit that differ from each other such that the beam packet is spatially incoherent;
a homogenization optical unit disposed downstream from the reshaping optical unit, wherein the homogenization optical unit contributes to the conversion of the beam packet into the line-type output beam, and wherein different beam segments, of the multiplicity of beam segments of the beam packet, after passing through the homogenization optical unit, are mixed and superposed along the line direction; and
a redirection optical unit disposed upstream from the reshaping optical unit, wherein the redirection optical unit is configured to redirect the at least one input laser beam into the reshaping optical unit through the input aperture in such a way that an incidence position or an incidence direction of the at least one input laser beam on the input aperture of the reshaping optical unit is changed in dependence on time, so that an angle distribution of the output beam is changed in dependence on time or an angle distribution of the beam packet emerging from the output aperture of the reshaping optical unit is changed in dependence of time.