TRUMPF Laser GmbH

A laser system includes a laser radiation source for emitting light, and an optical fiber unit that includes an optical fiber. The optical fiber includes a light guiding region, an input coupling end having a first fiber end surface for coupling the light into the light guiding region, and an output coupling end having a second fiber end surface for coupling the light out of the light guiding region. The laser system further includes a coupling device for coupling the light into the optical fiber unit, a reflection element configured to reflect the light coupled out of the light guiding region back toward the second fiber end surface to be coupled back into the light guiding region via the second fiber end surface, and a measuring device configured to capture the light reflected by the reflection element.

An apparatus for combining a plurality of coherent laser beams includes a splitting device configured to split an input laser beam into the plurality of coherent laser beams, a plurality of phase setting devices configured to adjust a respective phase of one of the plurality of coherent laser beams, and a beam combining device configured to combine the plurality of coherent laser beams, which emanate from a plurality of grid positions of a grid arrangement. The beam combining device includes a microlens arrangement having at least two microlens arrays. The apparatus further includes a controller configured to adjust a respective phase of a respective one of the plurality of coherent laser beams and/or vary a respective phase of a respective one of the plurality of coherent laser beams.

A device for coupling a laser beam into a double-clad fiber includes a first birefringent optical element configured to split the laser beam into two sub-laser beams polarized along base polarization components of the first birefringent optical element, a polarization rotation device configured to adjust a polarization of the sub-laser beams to provide polarization-adjusted sub-laser beams, a second birefringent optical element configured to split each of the polarization-adjusted sub-laser beams into two sub-sub-laser beams polarized along base polarization components of the second birefringent optical element, and an in-coupling optical unit configured to couple the sub-sub-laser beams with compensated first exit angles and/or first beam displacements into an inner core of the double-clad fiber, and to couple other sub-sub-laser beams into an annular core of the double-clad fiber.

A laser system includes a beam deflection unit, a control unit, a laser beam source for providing a pulsed input laser beam for coupling into the beam deflection unit, and a target area for arranging a target material. The control unit is configured to control and/or regulate a position of a pulsed laser beam emerging from the beam deflection unit by actuating the beam deflection unit. The control unit has a first operating mode, in which the position of the pulsed laser beam is selected so that it is directed onto the target area, and a second operating mode, in which the position of the pulsed laser beam is selected so that it misses the target area. Pulsed laser beams provided in the second operating mode are positioned symmetrically in a chronological and/or spatial average with respect to the pulsed laser beams formed in the first operating mode.

A laser device includes a laser bench, and a semiconductor laser attached to the laser bench. The semiconductor laser is configured to emit laser light along a laser axis. The laser device further includes a first optical element for forming the laser light, a temperature element for controlling a temperature of the laser device, a holding element, and a Bragg grating body attached to the holding element and spaced apart from the laser bench.

A device for transporting pulsed laser radiation includes a pulse duration setting device configured for setting a transport pulse duration of the pulsed laser radiation. the device further includes a hollow core optical fiber having a hollow core surrounded by a material. The hollow core optical fiber is configured to be operated with beam path parameter values that are present at the first fiber end and lie in a target tolerance range. The device further includes a fiber input coupling device configured to couple the pulsed laser radiation into the hollow core optical fiber with the beam path parameter values that lie in the target tolerance range. the transport pulse duration is set so that input coupling of the pulsed laser radiation into the hollow core is provided for all of the beam path parameter values in the target tolerance range.

A mode field adapter for adapting a mode field of an input fibre to a mode field of an output fibre includes a mode field adapter fibre. The mode field adapter fibre includes a mode field adaptation section for adapting a mode field diameter of the mode field of the input fibre to the mode field of the output fibre. The mode field adapter fibre has a length between 5 mm and 150 mm. The mode field adaptation section has a length between 5 mm and 150 mm. The mode field adapter fibre is configured to transfer light from the input fibre in a polarization maintaining manner into the output fibre.

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.

A device for beam shaping of a laser beam includes a prism, a polarization rotator, and a thin-film polarizer. The prism is configured to split an incident laser beam into a first beam half and a second beam half. The first beam half is input coupled into the prism. The first beam half enters the prism at a first incidence side arranged at the Brewster angle vis-à-vis the incident laser beam. The first beam half input coupled into the prism is output coupled from the prism at an exit side of the prism at the Brewster angle. The thin-film polarizer is traversed by the first beam half output coupled from the prism. The polarization rotator rotates a polarization of the second beam half. The second beam half is reflected by the thin-film polarizer. The thin-film polarizer superimposes the first beam half and the second beam half.

A beam shutter is for a laser beam. The beam shutter includes: a reflecting optical unit configured to deflect the laser beam; a holding arm, which is capable of being brought into a release position and a shut-off position and on which the reflecting optical unit is held; a sensor circuit with at least one sensor component arranged between the reflecting optical unit and the holding arm; and an evaluation device, which is configured to interact with the sensor circuit, at least in the shut-off position of the holding arm.