46 results about "Beam parameter product" patented technology

An optical delivery waveguide for a material laser processing system includes a small lens at an output end of the delivery waveguide, transforming laser beam divergence inside the waveguide into a spot size after the lens. By varying the input convergence angle and/or launch angle of the laser beam launched into the waveguide, the output spot size can be continuously varied, thus enabling a continuous and real-time laser spot size adjustment on the workpiece, without having to replace the delivery waveguide or a process head. A divergence of the laser beam can also be adjusted dynamically and in concert with the spot size.

A method of cutting a workpiece (30) to be cut by a laser beam (10), in which an incident laser beam (10) is generated that has an initial beam parameter product (BPP), given by means of a laser source (1), preferably an ytterbium-doped or erbium-doped fibre laser source, coupled to at least one optical fibre for conveying the beam. Said incident laser beam (10) is brought to a focusing head (3, 4) comprising at least one optical focusing device (14). The incident laser beam (10) is focused by means of said optical focusing device (14), so as to obtain a focused laser beam, and the workpiece (30) is cut by means of the focused laser beam. According to the invention, the quality factor of the incident laser beam (10) is adjusted or modified by means of an optical device (16) designed to be able to modify or vary the BPP of a laser beam so as to obtain a modified focused laser beam (10b) having a modified BPP which is different from the BPP of said incident laser beam. Associated equipment for implementing said method.

In various embodiments, a beam-parameter adjustment system and focusing system alters a spatial power distribution of a plurality of radiation beams before the beams are coupled into an optical fiber.

The invention may be embodied in other forms than those specifically disclosed herein without departing from itMulti-kW-class blue (400-495 nm) fiber- delivered lasers and module configurations. In embodiments, the lasers propagate laser beams having beam parameter products of < 5 mm*mrad, which are used in materials processing, welding and pumping a Raman laser. In an embodiment the laser systemis an integration of fiber-coupled modules, which are in turn made up of submodules. An embodiment has sub-modules having a plurality of lensed blue semiconductor gain chips with low reflectivity front facets. These are locked in wavelength with a wavelength spread of < 1 nm by using volume Bragg gratings in an external cavity configuration. An embodiment has modules having of a plurality of submodules, which are combined through wavelength multiplexing with a bandwidth of < 10 nm, followed by polarization beam combining. The output of each module is fiber- coupled into a low NA fiber. In an embodiment a kW-level blue laser system is realized by fiber bundling and combining multiple modules into a single output fiber.

A laser processing machine includes a beam parameter product variable device, and a beam diameter variable device. The beam parameter product variable device sets beam parameter products of a laser beam to a predetermined value. The beam diameter variable device includes a first lens that is movable in an optical axis direction and having a positive focal length, and converts divergent light of a laser beam emitted from an emission end of the laser beam into convergent light, and a second lens that is movable in the optical axis direction and having a negative focal length on which the convergent light is incident. A third lens having a positive focal length, focuses the laser beam emitted from the beam diameter variable device, and irradiates a plate material with the focused laser beam.

An apparatus includes a laser system that includes a first fiber having an output end and situated to propagate a first laser beam with a first beam parameter product (bpp) and a second fiber having an input end spliced to the output end of the first fiber at a fiber splice so as to receive the first laser beam and to form a second laser beam having a second bpp that is greater than the first bpp,wherein the output end of the first fiber and the input end of the second fiber are spliced at a tilt angle so as to increase the first bpp to the second bpp.

Apparatus (10) for laser processing a material (11), which apparatus comprises a laser (1) and a beam delivery cable (2), wherein: the laser (1) is connected to the beam delivery cable (2); the beam delivery cable (2) is configured to transmit laser radiation (13) emitted from the laser (1), and the laser radiation (13) is defined by a beam parameter product (4); and the apparatus (10) is characterized in that: the apparatus (10) includes at least one squeezing mechanism (5) comprising a periodic surface (6) defined by a pitch (7); a length (8) of optical fibre (9) that forms part of the laser (1) and/or the beam delivery cable (2) is located adjacent to the periodic surface (6); and the squeezing mechanism (5) is configured to squeeze the periodic surface (6) and the length (8) of the optical fibre (9) together with a squeezing force (12); whereby the beam parameter product (4) is able to be varied by adjusting the squeezing force (12).

A beam shaping device for a semiconductor laser is characterized in that (i) a light-emitting area of a semiconductor laser tube core is linearly amplified by an optical amplifying element, (ii) the light-emitting area is sectioned, each section is optically transformed in a 90-degree rotating manner by a 90-degree optical rotating element, (iii) spatial translation is performed on each section by an optical translation element, so that the sections are closer, and gaps among the sections are narrowed, (iv) an image in the light-emitting area is properly linearly reduced by an optical reduction element, so that a linear size and a divergence angle adapting to output are formed. By the aid of the device, the BPP (beam parameter product) of an output beam of the semiconductor laser is decreased, beam quality is improved, and a powerful technological path is provided for manufacture of a high-power semiconductor pump laser and a high-power direct semiconductor laser system.

The present invention is provided with: a light source unit (3) that emits excitation light (101); a light deflection unit (140) that deflects the excitation light (101); a wavelength conversion unit(160) that is irradiated with the excitation light (101) deflected by the light deflection unit (140), converts the excitation light (101) into wavelength-converted light of a different wavelength, and emits said wavelength-converted light; and a light-condensing unit (10) that condenses the excitation light (101) on the wavelength conversion unit (160). The light-condensing unit (10) comprises: afirst optical system (11) that is disposed between the light source unit (3) and the light deflection unit (140); and a second optical system (12) that is disposed between the light deflection unit (140) and the wavelength conversion unit (160). If an axis in a direction in which a beam parameter product of the excitation light (101) is at a minimum is referred to as the Ax axis, and an axis in adirection orthogonal to the Ax axis is referred to as the Ay axis, in a cross section orthogonal to the travel direction of the excitation light (101), the focal distance in the Ay axis direction inthe second optical system (12) is shorter than the focal distance in the Ax axis direction.

In various embodiments, laser delivery systems feature one or more optical elements for receiving a radiation beam and altering the spatial power distribution thereof, a lens manipulation system for changing a position of at least one optical element within the path of the radiation beam, and a controller for controlling the lens manipulation system to achieve a target altered spatial power distribution on a workpiece.

In various embodiments, the beam parameter product and/or numerical aperture of a laser beam is adjusted utilizing a step-clad optical fiber having a central core, a first cladding, an annular core, and a second cladding.

In various embodiments, the beam parameter product and/or beam shape of a laser beam is adjusted by directing the laser beam across a path along the input end of a cellular-core optical fiber. The beam emitted at the output end of the cellular-core optical fiber may be utilized to process a workpiece.

A semiconductor laser shaping device includes, along the light path of a semiconductor laser, a fast axis collimating lens, slow axis collimating lens, the half wave plate, a polarization beam combining prism, and a crawling prism group. The laser emitted by the semiconductor laser is collimated by a fast-axis collimating lens and then by a slow-axis collimating lens, and subsequently injected into a half wave plate and polarization beam combining prism, which compresses its spot size along the slow axis while keeping the spot size unchanged along the fast axis. The laser beam then passes through the crawling prism group, which shifts a portion of the light in the slow-axis direction to the fast-axis direction, which again compresses the light beam in the slow-axis direction. The device can reduce the beam size of a semiconductor laser in the slow-axis direction, reducing its beam parameter product and improving beam quality.

A method includes generating a multimode laser beam having an initial beam parameter product (bpp) and directing the multimode laser beam to an input end of a fiber so as to produce an output beam atan output of the fiber with a final bpp that is greater than the initial bpp. Another method includes measuring a base bpp associated with a multimode laser beam generated from a laser source and emitted from an output fiber output end, determining a bpp increase for the multimode laser beam, and selecting a bpp increasing optical fiber having an input end and an output end so that the multimode laser beam with the base bpp coupled to the input end has an output bpp at the output end of the bpp increasing optical fiber corresponding to the determined bpp increase.

In a diode laser structure (2) with a plurality of strip emitters (31 to 38) arranged side by side whose SA-axes are arranged in the same direction and at an offset to each other in this direction, wherein the beam parameter products (BPPSA) of at least a few of the strip emitters (31 to 38) are each shifted relative to the SA-axis, according to the invention the beam parameter product (BPPSA) of the strip emitters (31 to 38) decreases, starting from the middle of the diode laser structure (2), to the two edges of the diode laser structure (2), in particular in a mirror-symmetrical manner and/or from the middle of the diode laser structure (2).

The present invention relates to the field of human body soft tissue combined treatment of continuous pumping of acousto-optic Q-switched solid visible laser and semiconductor near-infrared laser, andparticularly discloses a dual-wavelength high-power surgical instrument for prostate laser resection in the field of high-power laser prostatectomy. The dual-wavelength high-power surgical instrumentis characterized in that a laser head comprises a solid-state laser capable of outputting a green visible beam and a semiconductor laser capable of outputting a near-infrared laser beam, the green visible laser beam and near-infrared beam are coupled via an aspheric lens to surgical fibers having a core diameter of 400-800 [mu]m, the solid-state laser includes at least 2 sound field direction vertical cross-acousto-optic Q-switches and at least one laser nonlinear double-frequency crystal, and an output fiber of the semiconductor laser has a beam parameter product that is smaller than a beamparameter product of a surgical fiber. The dual-wavelength high-power surgical instrument has advantages of good safety, easy operation, low technical skill requirements for physicians, etc.

Systems, apparatuses, and methods are described for modifying a beam parameter product of a laser beam. The modified beam parameter product may increase the number of tasks that may be performed usinga given laser with its original beam parameter product. By increasing the beam parameter product of a laser, an initial low beam parameter product beam may be used to perform tasks requiring a higherbeam parameter product. The beam may be modified to redirect portions of the beam at different angles via one or more non-imaging refracting optical components or by one or more Fiber Bragg gratings.