A light reflection device comprises a reflection member having a reflection surface that is formed in a planar shape. The reflection surface reflects incident light. The reflection member performs a revolution and a rotation simultaneously. A direction of the revolution of the reflection member and a direction of the rotation of the reflection member are the same. Angular velocity of the revolution of the reflection member is equal to twice angular velocity of the rotation of the reflection member.

A laser ablation method for engraving a workpiece with a texture by a laser beam emitted by a laser head integrated in a machine tool comprising: a. generating a plurality of machining layers based on the geometry of the workpiece to be machined in succession; b. generating for each machining layer a plurality of patches, each of which defines an area which is to be machined from a single position of the laser head, wherein a first patch and a second patch are positioned adjacent having a common border defined as a patch junction, wherein at least one of the patch includes an non-ablation area and an ablation area based on the texture to be engraved, and the ablation area includes a plurality of laser vectors having two ends defining the path of the laser beam to remove the material of the ablation area, wherein at least one laser vector in the first patch and at least one laser vector in the second patch having a common end at the patch junction are defined as intersected laser vectors and the position of the common end is defined as an intersection position; and c. reducing the number of intersected laser vectors by eliminating at least one intersection position.

A method for manufacturing a large-area volume grating includes: (1) splitting a laser beam into two or more laser beams, converging the two or more laser beams into a sample at an angle less than 60° to form a first plasma grating; (2) moving the sample in a longitudinal direction of a plane vertical to the first plasma grating to etch out a first prefabricated volume grating; (3) moving the sample laterally to form a second plasma grating, an effective cross section of the first prefabricated volume grating partially overlapping with that of the second plasma grating, then moving the sample in a longitudinal direction of a plane vertical to the second plasma grating to etch out a second prefabricated volume; and (4) repeating steps (2) and (3) n times to obtain a volume grating in any size.

Reclamation or recycling of a semiconductor workpiece includes vaporizing the structures and materials deposited, implanted, or formed in or on the substrate with minimally acceptable damage to the crystalline substrate through direct ionic vaporization rather than thermal ablation. The purity of the substrate therefore remains substantially free from heavy metal surface contamination and has a surface roughness that may be polished back to a mirror-like finish using chemical mechanical polishing or lapping processes. The process includes focusing coherent light on a surface of the substrate with a predetermined wavelength, power, pulse width, and pulse rate or number of pulses per unit area that causes direct ionic vaporization of material formed in or on the surface of the substrate up to a predetermined penetration depth. Advantageously, patterned, previously used test, and out of specification wafers may be reclaimed for reuse or recycled without risk of the unintended disclosure of intellectual property.

A method for joining at least two components of a fuel cell, especially for joining two single plates of a fuel cell to make a bipolar plate, comprises: providing a first component of the fuel cell and providing at least one second component of the fuel cell; and directing a pulsed laser beam of a laser apparatus onto a rotating mirrored polygon wheel, by which the laser beam forms a joint line consisting of a plurality of overlapping pointlike and/or line-shaped joining locations on the components. A device for carrying out the method is also provided.

A method of processing a transparent member, the transparent member having a first surface extending perpendicularly to the direction of laser light emission, and a second surface and a third surface that are connected to the first surface, the method including emitting laser light in the direction perpendicular to the first surface, and scanning the laser light in the direction parallel to the first surface, wherein the second surface of the transparent member is an inclined surface, or an inclined surface is disposed on the same side of the transparent member as the second surface, and, by causing the laser light to reflect on the inclined surface toward the third surface, a modified region is formed in a region having up to 2 mm depth from the third surface from the first surface to the lower end of the third surface in the direction of laser light emission.

There is provided an optical axis alignment mechanism between the laser oscillator and the optical fiber. The laser oscillator emits laser light, which then emerges from the emission end of the optical fiber via the axis alignment mechanism. Part of the laser light is received on the light-receiving surface of the CCD camera of a laser light evaluator. Thus, the laser light evaluator acquires a light intensity distribution. The light intensity distribution is used by the optical axis alignment mechanism to align the axis of the laser oscillator with the axis of the optical fiber.

Laser welding of a first metal substrate having a first planar surface and a second planar surface disposed opposite the first planar surface to a second metal substrate is performed by placing an end face of the second metal substrate proximate to the first planar surface. An input laser beam from a fiber laser is generated, and a beam delivery system is provided that is configured to receive the input laser beam and generate an output laser beam having a beam spot that moves in a predetermined pattern along a first and a second axes to irradiate a target area on the second planar surface such that the target area is positioned over an intersection region of the first planar surface where the end face is positioned proximate to the first planar surface.

A laser irradiation apparatus includes: a laser module configured to emit a laser beam; a first optical system configured to scan the laser beam emitted from the laser module along a first direction; an optical element configured to refract the laser beam emitted from the first optical system; and a substrate supporter on which a base substrate to which the laser beam refracted through the optical element reaches is arranged.

The invention relates to a device (2) for working a surface (4) of a workpiece (6) by means of a laser beam (8), comprising a laser system (12) for providing the laser beam (8) and a plasma nozzle (14), which is designed to produce an atmospheric plasma jet (16), wherein the plasma nozzle (14) has a nozzle opening (24, 24′), from which a plasma jet (8) produced in the plasma nozzle (24, 24′) exits during operation, wherein the laser system (12) and the plasma nozzle (14) are arranged in relation to each other and designed in such a way that, during operation, the laser beam (8) exits from the nozzle opening (24, 24′) of the plasma nozzle (14) together with the plasma jet (16). The invention further relates to an assembly (100) having such a device and to a method for operating said device (2).