The present disclosure provides a device and a method for laser-based separation of a transparent, brittle workpiece, comprising a laser that emits a laser beam having an intensity (I.sub.L) along an optical axis (P), and an optical device. The optical device has at least one one-piece double axicon. The double axicon has an entrance surface and the optical device has an exit surface. The entrance surface is such that in the double axicon, a ring beam is formed. The intensity (I.sub.L) in the double axicon is lower than the threshold intensity (I.sub.S) of the material of the double axicon. The exit surface is such that a line focus having a maximum intensity (I.sub.max) and a length (L.sub.T) is generated in the direction of the laser beam behind the exit.

A laser machining head controls an irradiation position of a laser beam on a machining target by rotating a first parallel plate by a first motor and rotating a second parallel plate by a second motor. A first holder holding the first parallel plate has a first rotation angle identification unit, and a second holder holding the second parallel plate has a second rotation angle identification unit. The first rotation angle identification unit has a positioning surface that allows positioning relative to the first parallel plate, and the second rotation angle identification unit has a positioning surface that allows positioning relative to the second parallel plate.

A laser beam profiler unit for measuring an intensity distribution of a laser beam oscillated from a laser oscillator includes a magnifying optical system for magnifying a spot diameter of the laser beam oscillated from the laser oscillator and focused by a condensing lens, a first transmission prism for attenuating the laser beam, a second transmission prism for further attenuating a laser beam reflected by the first transmission prism, an image capturing element for detecting the laser beam reflected by the second transmission prism, and an analyzer for analyzing an intensity distribution of a spot of the laser beam from data of the laser beam detected by the image capturing element.

A lens system for use with a high laser power density scanning system is disclosed and includes a first lens group having one or more refractive optical elements therein. The first lens group is in communication with at least one high average power laser scanning system and is configured to transmit at least one high average laser power density signal there through. At least a second lens group having one or more refractive optical elements therein is in communication with the laser scanning system via the first lens group. The second lens group is configured to transmit the high average laser power density signal there through. At least one diffractive optical element may be in communication with at least one of the first lens group and the second lens group and is configured to transmit the at least one high average laser power density signal there through.

A gas permeable glass window, suitable for use with liquid interface additive manufacturing, has an optically transparent glass article greater than about 0.5 millimeters in thickness defining a first surface and a second surface. A plurality of gas channels are disposed through the article from the first surface to the second surface. The gas channels occupy less than about 1.0% of a surface area of the article and are configured such that the article has a gas permeability between about 10 barrers and about 2000 barrers.

Disclosed is a method for cutting dielectric or semiconducting material with a laser. The method includes the following steps: emission of a laser beam including at least one burst of N femtoseconds laser pulses; spatial separation of the laser beam into a first split beam having a first energy, and respectively, a second split beam having a second energy; spatial concentration of energy of the first split beam in a first zone of the material, respectively, of the second split beam in a second zone of the material, the first zone and the second zone being separate and staggered by a distance dx; and adjustment of the distance between the first zone and the second zone in such a way as to initiate a straight micro-fracture oriented between the first zone and the second zone.

A high power laser system for providing laser beams in various laser beam patterns along a laser beam path that is positioned to provide for the in situ laser processing of materials in tubulars, such as pipes in a hydrocarbon producing well. Laser treating for providing flow assurance by direct and indirect laser processing of materials interfering with flow.

A method for joining two components of a meltable material comprises the steps of providing a first component having a first border region and a second component having a second border region, placing the second component relative to the first component so as to form an overlap between the first border region and the second border region under a gap between the first border region and the second border region, continuously heating opposed sections of the first border region and the second border region at the same time through at least one energy source arranged in the gap at least partially, continuously providing a relative motion of the at least one energy source along the first border region and the second border region in the gap, and continuously pressing already heated sections of the first border region and the second border region onto each other.

A method for processing a transparent workpiece includes forming a contour of defect in the transparent workpiece and separating the transparent workpiece along the contour using an infrared laser beam. During separation, the method also includes detecting a position and propagation direction of a crack tip relative to a reference location and propagation direction of an infrared beam spot, determining a detected distance and angular offset between the crack tip and the reference location of the infrared beam spot, comparing the detected distance to a preset distance, comparing the detected angular offset to a preset angular offset, and modifying at least one of a power of the infrared laser beam or a speed of relative translation between the infrared laser beam and the transparent workpiece in response to a difference between the detected distance and the preset distance and between the detected angular offset and the preset angular offset.

Apparatus and methods for laser bond inspection (LBI) of internal bonds in a composite structure with limited access. The technology solves the problem of access for an LBI process head through selection of optics, an articulated optical path and simplification of the method of collecting debris. A small-format process head is specifically designed for laser bond inspection in limited-access spaces. This process head allows access to locations within inch of a nearby wall or structure and utilizes a laser beam that is much smaller (2-3 mm) in diameter. The apparatus incorporates articulated joints to improve access to locations in the structure being inspected. The process head may also be configured to protect the optical elements (e.g., the focusing lens) from blow-back of debris from the LBI inspection process.