Abstract: A system includes an ultrashort pulse laser for providing a laser beam, a hollow core fiber, an input coupling optical unit configured to input couple the laser beam into the hollow core fiber, a lens device on which an output coupled laser beam from the hollow core fiber is incident, a beam shaping element on which the laser beam emerging from the lens device is incident, and a focusing optical unit. The lens device is configured to adjust a divergence angle of the output coupled laser beam for adjusting a beam diameter of the laser beam on the beam shaping element. The beam shaping element is configured to impose upon the laser beam a quasi-non-diffractive beam shape with a focal zone that is elongated in the beam propagation direction. The focusing optical unit is configured to set a penetration depth of the focal zone in or on the material.

Abstract: An apparatus for combining a plurality of coherent laser beams includes a splitting device for splitting an input laser beam into the plurality of coherent laser beams, a plurality of phase setting devices for adjusting a respective phase of one of the coherent laser beams, and a beam combining device for combining the coherent laser beams, which emanate from a plurality of grid positions of a grid arrangement, to form at least one combined laser beam. The beam combining device has a microlens arrangement with exactly one microlens array for forming the at least one combined laser beam.

Abstract: A device for machining a workpiece by impressing an anti-glare functionalization with laser pulses, including a laser configured to provide a laser beam with laser pulses and a first and second diffusing lens configured to scatter the laser beam and impress a locally randomized intensity distribution onto the laser beam in a focal plane. The first diffusing lens scatters the laser beam and the second diffusing lens scatters the scattered laser beam. An optical focusing system is configured to focus the laser beam onto a focus zone in the focal plane on the workpiece. The laser beam is applied to the workpiece. An advancing device moves the laser beam and the workpiece relative to one another and includes a scanner having a first and second scanner element. The second scanner element includes the second diffusing lens. Movement of the scanner elements modifies the locally randomized intensity distribution.

Abstract: A method for separating a workpiece along a separation line by using laser pulses of a laser beam includes splitting the laser beam into a plurality of partial laser beams using a beam splitter optical unit, focusing the plurality of partial laser beams onto a surface of the workpiece and/or into a volume of the workpiece using a focusing optical unit, so that the plurality of partial laser beams are arranged next to one another and spaced apart from one another along the separation line, and ablating material of the workpiece along the separation line by introducing the laser pulses of the plurality of partial laser beams into the workpiece. The laser power per partial laser beam is adjusted depending on an ablation depth obtained in the workpiece.

Abstract: An apparatus for combining a plurality of coherent laser beams includes a splitting device for splitting an input laser beam into the plurality of coherent laser beams, a plurality of phase setting devices for adjusting a respective phase of one of the coherent laser beams, and a beam combining device for combining the coherent laser beams, which emanate from a plurality of grid positions of a grid arrangement, to form at least one combined laser beam. The beam combining device has a microlens arrangement with exactly one microlens array for forming the at least one combined laser beam.

Abstract: A method for laser processing of a workpiece that has a transparent material includes dividing an input laser beam into a plurality of sub-beams by using a beam splitting element, focusing the sub-beams coupled out of the beam splitting element to form multiple focus elements, and applying the focus elements to the material of the workpiece for the laser processing. The focus elements are moved relative to the material in a feed direction. A first sub-quantity of the focus elements is arranged in a first plane. A second sub-quantity of the focus elements is arranged in at least one other plane. The first plane and the at least one other plane are spaced apart in the feed direction. The first plane and the at least one other plane are orientated perpendicular to the feed direction.

Abstract: An optical system for a laser system for laser cutting includes a light guide for simultaneously coaxially transporting a first laser beam as a single-mode or quasi-single-mode laser beam and a second laser beam as a multi-mode laser beam, and an optical device arranged in a beam path of the first laser beam downstream of the light guide. The optical device is configured to impose a phase singularity and/or a polarization singularity on the first laser beam for generating an annular intensity distribution of the first laser beam with a central intensity minimum on an optical axis of the optical system.

Abstract: 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.

Abstract: A method for generating secondary radiation includes providing a target material in a target region, and applying a pulse sequence of laser pulses to the target material in the target region. Secondary radiation is generated as a result of interaction of the target material with the pulse sequence. The pulse sequence has a pulse train of at least two pre-pulses and a main pulse following the pulse train. A total energy of the pre-pulses of the pulse train is between 0.2 mJ and 10 mJ. A temporal pulse interval between successive pre-pulses of the pulse train is between 50 ps and 500 ns. A pulse energy of the main pulse is between 2 mJ and 50 mJ. A pulse duration of the main pulse is between 15 fs and 300 fs. A temporal pulse interval between the pulse train and the main pulse is between 1 ns and 1 ?s.

Abstract: A method for generating secondary radiation includes providing a target material in a target region, and applying a pulse sequence comprising laser pulses to the target material in the target region. Interaction of the target material with the pulse sequence generates secondary radiation. The pulse sequence includes a prepulse and a main pulse trailing the prepulse. A pulse energy of the prepulse is between 2 ?J und 200 ?J. A pulse duration of the prepulse is between 200 fs and 5 ps. A pulse energy of the main pulse is between 2 mJ and 50 mJ. A pulse duration of the main pulse is between 15 fs and 300 fs. A pulse time interval between the prepulse and the main pulse is between 1 ps and 1 ns.

Abstract: A method for separating an ultrathin glass using ultrashort laser pulses of an ultrashort pulse laser includes focusing the ultrashort laser pulses into the ultrathin glass such that a resulting focal zone is elongated in a beam direction and extends over an entire thickness of the ultrathin glass. The ultrashort laser pulses have a non-radially symmetric beam cross section perpendicular to a beam propagation direction. The method further includes introducing material modifications into the ultrathin glass along a separating line using the ultrashort laser pulses focused into the ultrathin glass, and separating the ultrathin glass along the separating line.

Abstract: A laser system for generating secondary radiation through interaction of a focused primary laser beam with a target material includes a laser beam source for providing a raw laser beam, and a beam guidance device for forming the focused primary laser beam from the raw laser beam. The focused primary laser beam is directed towards a target region in order to interact with the target material arranged in the target region. The beam guidance device includes a beam focusing device configured to form the primary laser beam by focusing a laser beam entering the beam focusing device, which corresponds to the raw laser beam. The beam focusing device includes at least two mirror elements spaced apart from one another. The beam focusing device has a numerical aperture between 0.001 and 0.01 provided that the primary laser beam propagates in a medium with a refractive index of less than 1.01.

Abstract: A method for laser welding of a workpiece includes providing a laser beam using a laser beam source, collimating the laser beam using a collimation optical unit, reshaping the collimated laser beam using a reshaping optical unit, and focusing the reshaped laser beam using a focusing unit. The focused laser beam is directed onto the workpiece to be welded. The reshaping optical unit has a first partial region in which at least one part of at least one axicon is embodied. At least a part of a beam cross-section of the collimated laser beam is directed onto the partial region of the reshaping optical unit.

Abstract: A method for laser processing of a workpiece that has a transparent material includes dividing an input laser beam into a plurality of sub-beams by using a beam splitting element, focusing the sub-beams coupled out of the beam splitting element to form multiple focus elements, and applying the focus elements to the material of the workpiece for the laser processing. The focus elements are moved relative to the material in a feed direction. A first sub-quantity of the focus elements is arranged in a first plane. A second sub-quantity of the focus elements is arranged in at least one other plane. The first plane and the at least one other plane are spaced apart in the feed direction. The first plane and the at least one other plane are orientated perpendicular to the feed direction.

Abstract: A method for separating a workpiece includes providing a machining laser beam that forms a plurality of focusing elements, introducing the focusing elements into a material of the workpiece, and moving the focusing elements parallel to an advancing line relative to the material. Material modifications are formed in the material along a machining surface that protrudes with respect to a partial region of the workpiece in a preferred direction. The method further includes subjecting the material to a heating laser beam that is moved relative to the material along a heating laser beam advancing line, thereby separating the material along the machining surface. The heating laser beam advancing line runs parallel to and is spaced apart from the advancing line with a positional offset that is anti-parallel to the preferred direction. The positional offset is at least 10% and at most 50% of a diameter of the heating laser beam.

Abstract: A diffractive optical element for imposing a phase distribution on a transverse beam profile of a laser beam includes surface elements that adjoin one another and form a sheet-like grating structure. Each surface element is assigned a phase shift value. The phase shift values define a two-dimensional phase distribution. The two-dimensional phase distribution has a beam center position, which defines a radial direction in the sheet-like grating structure. The surface elements are assigned to a plurality of angle segments. Each angle segment has an azimuthal segment width with respect to the beam center position. The phase shift values in the angle segments form radially symmetrical phase profiles respectively with respect to the beam center position. The radially symmetrical phase profiles form in the radial direction grating functions that have a same grating period. A segment grating phase is assigned to each of the grating functions.

Abstract: A laser system for laser machining a workpiece using an interference pattern includes at least one laser beam source for providing a plurality of coherent laser beams, an amplification device for forming amplified coherent laser beams by amplifying the plurality of coherent laser beams, a phase adjustment device for adjusting a phase difference between the plurality of coherent laser beams and/or the amplified coherent laser beams, and a beam convergence region in which output laser beams based on the amplified coherent laser beams or corresponding to the amplified coherent laser beams converge to form the interference pattern. At least beam portions of the different output laser beams converge in the beam convergence region.

Abstract: A transparent component includes a functionalized surface. The functionalized surface has dimples and laser-induced periodic surface structures. The functionalized surface is functionalized by the dimples and the laser-induced periodic surface structures. The dimples and the laser-induced periodic surface structures spatially overlap. The dimples have a depth between 100 nm and 2000 nm.

Abstract: A method for producing dimples on a surface of a transparent material using laser pulses of a short-pulse laser is provided. The method includes producing at least one dimple of the dimples on the surface of the transparent material by using a single laser pulse or a single laser burst.

Abstract: A method for laser processing a workpiece is provided. The workpiece includes a material transparent to a laser beam of the laser processing. The method includes splitting an input laser beam by using a beam splitter into a plurality of partial beams. The splitting of the input laser beam is performed by application of phases to a beam cross section of the input laser beam. The method further includes focusing the plurality of partial beams decoupled from the beam splitter by using a focusing optical unit. Multiple focus elements are formed by the focusing of the plurality of partial beams. The method further includes subjecting the material of the workpiece to at least a subset of the multiple focus elements. The application of the phases is performed in such a way that at least two of the multiple focus elements have different intensities.