Abstract: A device for determining a focus position of a laser beam in a laser machining system has a first optical element which is designed to reflect a portion of the laser beam in order to uncouple a first sub-beam of the laser beam, a second optical element which is designed to reflect another portion of the laser beam in order to uncouple a second sub-beam of the laser beam substantially coaxially to the first sub-beam, a spatially-resolving sensor to which the first sub-beam and the second sub-beam can be directed, and an evaluation unit which is designed to determine a focus position of the laser beam on the basis of the first and second sub-beams hitting the spatially-resolving sensor.

Abstract: A laser machining system for machining a workpiece uses a laser beam, preferably for cutting or welding a workpiece using a laser beam. The laser machining system includes a machining head with a housing having an opening for emitting the laser beam from the machining head, a measuring device configured to direct an optical measurement beam through the opening, and an optical unit for aligning the laser beam and the optical measurement beam, the optical unit being settable to adjust the laser beam and the optical measurement beam perpendicular to the optical axis of the machining head in the region of the opening. The measuring device is further configured to determine a setting of the optical unit corresponding to the central alignment of the laser beam on the basis of measurement values based on reflections of the optical measurement beam for different settings of the optical unit.

Abstract: A machining head is provided for a laser machining system configured to machine a workpiece using a laser beam. The machining head includes a housing having an opening for emitting the laser beam from the machining head; at least one reflective reference at the housing; and a measuring device configured to direct an optical measurement beam towards the opening and the at least one reflective reference. The measuring device is further configured to determine a distance (d1) between the end portion and the workpiece on the basis of a first reflection (A) of the optical measurement beam from the at least one reflective reference and a second reflection (B) of the optical measurement beam from the workpiece.

Abstract: The invention relates to a device (100) for an additive manufacture. The device (100) comprises a laser device (110) for machining material using a laser beam (112), said laser device (110) being designed to deflect the laser beam (112) onto a machining region of a workpiece (10); at least one supply device (130) for a supply material, said supply device being designed to supply the supply material to the machining region; and an interferometer (140) which is designed to measure a distance to the workpiece (10) by means of an optical measuring beam (142).

Abstract: A device for determining a focus position of a laser beam in a laser machining system includes an optical element configured to reflect a portion of the laser beam for coupling out a first sub-beam of the laser beam, a spatially resolving sensor to which the first sub-beam can be directed, and an evaluation unit configured to determine a focus position of the laser beam based on an actual diameter of the first sub-beam incident on the spatially resolving sensor, a laser beam power, and calibration data.

Abstract: A device is provided for determining an orientation of an optical device of a coherence tomograph. The device has an optical reference geometry, a deflection optics configured to direct an optical measuring beam reflected by the optical device onto the optical reference geometry, and an evaluation unit configured to determine a distance between a first reference plane and at least one second reference plane of the optical reference geometry in order to determine the orientation of the optical device.

Abstract: A device for a laser machining system includes a laser beam optics for a machining laser beam with an arrangement of optical elements arranged one after the other in a beam path of the machining laser beam. With respect to a direction of propagation of the machining laser beam, a first outermost optical element of the arrangement of optical elements consists of a material with a thermal conductivity coefficient kT of 2 W/(m·K) or more.

Abstract: A measuring device determines a distance between a processing head for a laser processing system configured to process a workpiece with a laser beam and the workpiece. The measuring device includes an optical coherence tomograph to measure a distance between the processing head and workpiece. In the optical coherence tomograph, measuring light generated by a measuring light source and reflected by the workpiece interferes with measuring light reflected in a reference arm with two or more reference stages. The stages include a first reference stage configured such that the measuring light reflected therein travels a first optical path length, and a second reference stage configured such that the measuring light reflected therein travels a second optical path length different from the first length, wherein the measuring light reflected by the workpiece interferes with reflected measuring light of the first reference stage and reflected measuring light of the second reference stage.

Abstract: A system for detecting machining errors for a laser machining system for machining a workpiece includes: a detection unit for detecting image data and height data of a machined workpiece surface; and a computing unit. The computing unit is designed to generate an input tensor based on the detected image data and height data and to determine an output tensor on the basis of the input tensor using a transfer function. The output tensor contains information on a machining error.

Abstract: A method for identifying joining positions of workpieces includes capturing images of a joint by a camera, determining measurement data for the joining positions associated with a course of the joint from the images of the joint, determining a mathematical model of the joint course from a part of the measurement data, providing a curve based on the mathematical model for positioning a welding laser during a laser welding process along the curve.

Abstract: A method and a device for detecting a focal position of a laser beam, particularly a machining laser beam in a laser machining head, includes an optical element which is arranged in the laser beam converging toward the focal point and which is designed to outcouple a reflection from the laser beam path, and a sensor arrangement which is designed to detect beam characteristics of said laser beam in the region of the focal point in the laser extension direction, and which measures the outcoupled reflection of the laser beam at at least two locations that are offset to one another in the extension direction, in order to determine the current focal position.

Abstract: A gas supply device for a laser machining head is provided for generating a homogeneous gas flow. The gas supply device includes a gas inlet, a shared volume for superimposing a laser beam and the gas flow, and a gas channel system which, starting from the gas inlet, branches at least twice and connects the gas inlet with several outlet openings at the shared volume. The gas channel system and the outlet openings are configured to provide a substantially homogeneous gas flow to the shared volume.

Abstract: An insulation part for supporting an electrically conductive nozzle in an insulated manner, and a laser machining head with a housing (10), through which a working laser beam path (11) is guided. The working laser beam path (11) exits on the machining side through an electrically conductive nozzle (17). The electrically conductive nozzle (17) is supported on an insulation part (18), which is supported on the housing (10), and which, for the capacitive distance measurement, is electrically connected to an oscillating circuit (24) of a distance measuring circuit (22). To monitor the presence of an inexpensive insulation part (18) in a user-friendly manner, the insulation part (18) comprises a ferromagnetic body (26) and a sensor (27) for detecting the ferromagnetic body (26) is provided on the housing (10). The sensor is connected to a monitoring circuit (29) that, in the absence of an insulation part (18), outputs a warning signal.

Abstract: A laser machining system, or laser welding system, for machining a workpiece includes: a laser machining head for directing a laser beam onto a workpiece to produce a vapor capillary; an optical measuring device using an optical measuring beam; an image acquisition unit to capture an image of a region of the workpiece surface containing the vapor capillary and a measuring spot produced by irradiation with the measuring beam. The system determines positions of the measuring spot and vapor capillary based on the image. A method includes: directing the laser beam onto a workpiece surface to produce a vapor capillary; directing an optical measuring beam onto the surface to measure a depth of the vapor capillary; capturing an image of a region containing the vapor capillary and a measuring spot from the optical measuring beam; and determining, based on the captured image, position of the measuring spot and vapor capillary.

Abstract: The invention relates to a beam forming lens system for machining material using a laser beam, comprising a two-dimensional axicon array (10) featuring a plurality of microaxicons (11) for creating an annular laser beam intensity profile, the microaxicons (11) being provided with curved lateral surfaces (113). The invention also relates to an apparatus for machining material using a laser beam, comprising a beam forming lens system of said type and a focusing lens system (15) for focusing the laser beam onto a workpiece (18). The beam forming lens system is designed to create the annular laser beam intensity profile in a focal plane (F) of the focusing lens system (15).

Abstract: According to the invention, a Cartesian positioning device for positioning an optics includes an optics socket for holding the optics; a y actuating element for linear movement of the optics socket in the y direction, the y actuating element having a y slider at one end; an x actuating element for linear movement of the optics socket in the x direction, the x actuating element having an x slider at one end; wherein the x actuating element and the y actuating element are arranged on a support element and adjustable along the y direction. Furthermore, a laser machining head for machining a workpiece by means of a laser beam includes such a Cartesian positioning device for positioning an optics, the optics being arranged in a beam path of the laser machining head.

Abstract: An add-on module for intercoupling or interposing between a control device, in particular a system control, and a laser machining head of a laser machining system is provided. The add-on module includes: a first interface, and is connectable with the laser machining head and/or with at least one sensor device of the laser machining system via the first interface so as to exchange data; a second interface, wherein the add-on module is connectable to the control device via the second interface so as to exchange data; and a processing unit configured to process data and output the processed data via at least one of the first, second, and third interfaces. Furthermore, a laser machining device includes such an add-on module is provided.

Abstract: A method for monitoring a joining seam, in particular during joining by a laser beam, wherein in the processing direction before a processing point a joining site is measured in order to detect the position and geometry thereof, at least one position of a joining seam is determined from the position of the joining point, and in the processing direction after the processing point the joining seam is measured in order to detect the geometry thereof at the determined position. A device is also provided for carrying out said method and to a laser processing head equipped with such a device.