Collimator lens (21) and focusing lens (22) are provided with AR coating (23). AR coating (23) has a first reflectance for reflecting a first laser light higher than a second reflectance for reflecting a second laser light. Detector (25) detects diffusion light (DL) diffused by collimator lens (21) and focusing lens (22). Detector (25) has a first light receiving sensitivity for receiving the first laser light lower than a second light receiving sensitivity for receiving the second laser light.

A laser processing head for a laser beam uses actuators engaged with a delivery fiber end to deflect the fiber end relative to an optical axis. The laser beam from the fiber end is collimated by a collimator and is then focused by a focusing component disposed in the head beyond the collimator to a focal point. The focal point of the laser beam is deflected from the optical axis in relation to the deflection of the fiber end. The fiber end and the actuators are housed in a sealed module. Deflection of the laser beam can be sensed by reflecting portion of the laser beam to a sensing element so a control system can monitor and control the fiber end's movement. A mode-stripper in the sealed module removes light from cladding of the delivery fiber, and an actively cooled absorber in the module around the fiber absorbs the energy.

A laser processing apparatus includes a laser light output section, a first scanner and a second scanner, a distance measurement light emitting section, a reference member which is arranged at a position which is the other end of a correction optical path formed with the distance measurement light emitting section as one end of the correction optical path and is arranged such that an optical path length of the correction optical path is a predetermined reference distance, a distance measurement light receiving section which receives distance measurement light reflected by the workpiece or the reference member, a distance measuring section which measures a distance to the workpiece or the reference member, and a distance correcting section which compares a measurement result of the distance to the reference member with the reference distance stored in advance to correct the measurement result obtained by the distance measuring section.

Disclosed is a machine learning device of a cutting condition adjustment apparatus including: a state observation section that observes, as state variables indicating a current state of an environment, cutting condition data indicating a laser cutting condition for a laser cutting and oblique rearward temperature rise data indicating a temperature rise value at an oblique rearward part of a cutting front of a workpiece, a determination data acquisition unit that acquires temperature rise value determination data for determining propriety of the temperature rise value during cutting based on the laser cutting condition for the laser cutting as determination data indicating a propriety determination result of the cutting of the workpiece, and a learning unit that learns the temperature rise value and adjustment of the laser cutting condition for the laser cutting in association with each other using the state variables and the determination data.

The invention relates to an apparatus 100, 200, 300, 700 and a method 400 for machining a workpiece 101 with a laser beam 102. The apparatus 100, 200, 300, 700 comprises a machining unit 103 configured to provide a pressurized fluid jet 104 onto the workpiece 101 and to couple the laser beam 102 through at least one optical element 105 into the fluid jet 104 towards the workpiece 101. Further, it comprises a sensing unit 107 arranged to receive a laser-induced electromagnetic radiation 106 propagating away from the workpiece 101 through the fluid jet 104 and through at least one optical element, and configured to convert the received radiation 106 into a signal 108. The apparatus 100, 200, 300, 700 also comprises a signal processing unit 109 configured determine a state of machining the workpiece 101 based on the signal 108.

Laser processing head 10 includes housing 11 and a plurality of optical components. Housing 11 is provided with partition wall 11a, first and second light entrance ports 12a, 12b through which first and second laser beams A, B respectively enter, and light irradiation port 13. Laser processing head 10 includes first and second photodetectors 91b, 92a provided around first and second light entrance ports 12a, 12b, respectively. First photodetector 91b is disposed opposite to second photodetector 92a across partition wall 11a. First photodetector 91b receives light in the second wavelength band including the wavelength of second laser beam B, and second photodetector 92a receives light in the first wavelength band including the wavelength of first laser beam A.

A laser irradiation apparatus is a laser irradiation apparatus including a laser light source, the laser irradiation apparatus including a failure prediction unit configured to perform failure prediction on a movable part used when a substrate is processed by the laser light source, in which the failure prediction unit acquires a physical quantity when the movable part is movable, and derives a failure time of the movable part based on an acquired physical quantity.

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.

Apparatus for additively manufacturing three-dimensional objects by means of successive layerwise selective irradiation and consolidation of layers of a build material which can be consolidated by means of an energy beam, which apparatus comprises an irradiation device adapted to guide an energy beam across a build plane, wherein a calibration device is provided comprising a positioning unit, a determination unit and a calibration unit, preferably arranged in a process chamber of the apparatus, that is adapted to at least partially reflect the energy beam, wherein the irradiation device is adapted to guide the energy beam to the calibration unit for generating a reflected part of the energy beam, wherein the positioning unit is adapted to position the irradiation device dependent on at least one parameter of the reflected part of the energy beam determined via the determination unit.

A laser processing method for scanning over a first member in a first direction while irradiating the first member with a laser beam emitted from an oscillator, and joining the first member and a second member adjacent to the first member by a molten portion, the laser processing method including the steps of: in each of a first measurement region and a second measurement region different from the first measurement region, measuring an intensity of a welding light including any one of a heat radiation light radiated from at least one of the first member and the second member by irradiation with the laser beam, a plasma light, and a reflected light; and evaluating a processing state based on the intensity of the welding light measured in each of the first measurement region and the second measurement region, in which the first measurement region and the second measurement region are aligned in a second direction intersecting the first direction.