Trumpf Laser- Und Systemtechnik Gmbh

Trumpf Laser Gmbh

Daniel Grossmann

Malte Kumkar

Daniel Flamm

Jonas Kleiner

Myriam Kaiser

Hao Pang

A processing optical unit for workpiece processing includes a birefringent polarizer configured to split at least one input laser beam into a pair of partial beams polarized perpendicularly to one another. The processing optical unit further includes a focusing optical unit arranged downstream of the birefringent polarizer in the beam path and configured to focus the pair of partial beams onto focus zones in a focal plane. The processing optical unit is configured to produce at least partly overlapping focus zones of the pair of partial beams.

Processing optical unit, laser processing apparatus and method for laser processing

An apparatus for forming a laser beam can include a controllable spatial light modulator, a control device for controlling the light modulator, and a beam guiding optical unit, wherein the control device is configured to split a display plane of the light modulator into a plurality of display regions and to represent a first beam influencing structure in at least one first display region of the plurality of display regions and a second beam influencing structure in a second display region of the plurality of display regions, wherein the beam guiding optical unit is configured to cause the laser beam to interact along the direction of propagation thereof firstly with the first display region and then with the second display region.

Apparatus and method for forming a laser beam

For material processing of a material, which is in particular for a laser beam to a large extent transparent, asymmetric shaped modifications are created transverse to the propagation direction of the laser beam. Thereby, the laser beam is shaped for forming an elongated focus zone in the material, wherein the focus zone is such that it includes at least one intensity maximum, which is transverse flattened in a flattening direction, or a transverse and/or axial sequence of asymmetric intensity maxima, which are flattened in a sequence direction. After positioning the focus zone in the material, a modification is created and the material and the focus zone are moved relative to each other in the or across to the flattening direction or in the or across to the sequence direction for forming a crack along an induced preferred direction.

System for asymmetric optical beam shaping

A diffractive optical beam shaping element for imposing a phase distribution on a laser beam that is intended for laser processing of a material includes a phase mask that is shaped as an area and is configured for imposing a plurality of beam shaping phase distributions on the laser beam incident on to the phase mask. A virtual optical image is attributed to at least one of the plurality of beam shaping phase distributions, wherein the virtual image can be imaged into an elongated focus zone for creating a modification in the material to be processed. Multiple such elongated focus zones can spatially add up and interfere with each other, to modify an intensity distribution in the material and, for example, generate an asymmetric modification zone.

Diffractive optical beam shaping element

An optical system for shaping a laser beam includes a beam shaping element configured to receive the laser beam having a transverse input intensity profile and to impose a beam shaping phase distribution onto the laser beam. The optical system further includes a near field optical element, arranged downstream of the beam shaping element at a beam shaping distance and is configured to focus the laser beam into the focus zone. The imposed phase distribution results in a virtual optical image of the elongated focus zone located before the beam shaping element. The beam shaping distance corresponds to a propagation length of the laser beam within which the imposed phase distribution transforms the transverse input intensity profile into a transverse output intensity profile at the near field optical element.

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Ditzingen, Germany

Daniel Grossmann