Abstract: A device for wavelength coupling of laser beams (2a, . . . 2n) with different wavelengths (?1, . . . ?n), comprising: at least one laser source for generating a plurality of laser beams (2a, . . . , 2n), and an overlapping device for spatial overlapping of the plurality of laser beams (2a, . . . , 2n) for forming an overlapped laser beam with a plurality of wavelengths (?1 . . . ?n). The device has a feedback device arranged between the laser source and the overlapping device for feeding a radiation proportion of the laser beams (2a, . . . , 2n) to be overlapped back to the laser source, the feedback device comprising a partially reflecting angle-dispersive optical element, in particular a partially reflecting diffraction grating. The overlapping device may, for example, be configured as a transmitting or reflecting diffraction grating whose optical properties are adapted to the optical properties of the partially reflecting diffraction grating to overlap the laser beams (2a, . . .

Abstract: An optical beam switch includes at least one input optical wave guide, multiple output optical wave guides and an optical switching element for selectively switching a light beam guided in the at least one input optical wave guide to one of the output optical wave guides, in which the switching element is between the at least one input optical waveguide and the multiple output optical waveguides. The optical switching element includes a beam propagation element and an optical focusing system, where the beam propagation element has two mutually opposed end faces and where either the beam propagation element or the optical focusing system can be deflected and/or twisted transversely to an optical axis. The at least one input optical wave guide is attached to a first end face of the beam propagation element, and the output optical wave guides are attached to a second end face.

Abstract: The invention relates to a device for expanding a laser beam, in particular a UV laser beam, comprising: a telescope arrangement having two spherical folding mirrors for expanding the incident collimated laser beam and a lens which is arranged in the divergent beam path downstream of the telescope arrangement and which has a spherical lens face for collimating the expanded laser beam, the first folding mirror in the beam path being a convex-curved spherical folding mirror and the second folding mirror in the beam path being a concave-curved spherical folding mirror. The invention also relates to an associated method for expanding a laser beam.

Abstract: A method for monitoring a laser system including a plurality of laser modules connected in series, there being connected in parallel to each laser module a bypass arrangement for bridging the corresponding laser module, includes determining a first laser power of the laser system with a plurality of laser modules operational; activating the bypass arrangement of at least one laser module so that at least one of the plurality of laser modules is bypassed; determining a second laser power of the laser system with the at least one of the plurality of laser modules bypassed; and monitoring the laser system based on a difference between the first and second laser power.

Abstract: In a laser device having at least one gas-purged laser resonator which is arranged in a purging gas circuit which has upstream of the laser resonator both a low pressure generator for generating a purging gas excess pressure in the purging gas circuit and, between the low pressure generator and the laser resonator, a cleaning device for cleaning the purging gas, the purging gas being air, according to the invention the purging gas circuit has downstream of the laser resonator between the laser resonator and the low pressure generator an intake opening which is permanently open towards the atmosphere, the purging gas pressure (p1) generated by the low pressure generator being greater than the atmospheric air pressure (p0).

Abstract: A pump light assembly (6) for a disc laser (1), comprising: a focusing device, in particular a concave mirror (11), having a reflecting surface (10) for focusing a pump light beam (8) onto a laser-active medium (2), and a deflecting assembly for deflecting the pump light beam (8) between reflecting regions formed on the reflecting surface (10) and disposed in different angular regions about a central axis (12) of the reflecting surface (10). The deflecting device is configured to produce a deflection of the pump light beam (8) between in each case two of the reflecting regions with an optical path length (2 f+2 d1; 2 f+2 d2) that is greater than the optical path length (2f) in the case of telecentric imaging in order to compensate for a beam expansion of the pump light beam (8), caused by aberrations of the focusing device (11), in successive focusings onto the laser-active medium (2). The invention also relates to a disc laser (1) and to a method for pumping a laser-active medium (2).

Abstract: A fiber coupler with an inner tube, an inner fiber arranged within the inner tube and several outer fibers arranged around the inner fiber, is disclosed, wherein said fiber coupler tapers in the longitudinal direction of the inner fiber from a main section to a terminal section and the inner cross section on the inner tube corresponds to the diameter of the inner fiber along the tapering section of the fiber coupler.

Abstract: Laser machining system (60) comprises a high-power laser (61) for generating a high-power pump laser beam (HP-MM), control signal laser (62) for generating a control signal laser beam (SS), an optical fibre (64) leading from the two lasers to a laser machining head (63). The optical fibre has an SRS amplifier fibre (65) with an inner fibre core (65a) of higher brilliance and with an outer fibre core (65b) of lower brilliance surrounding the inner fibre core. The control signal laser beam (SS) is coupled into the inner fibre core and the pump laser beam (HP-MM) is coupled into the outer fibre core. The radiation component converted from the outer fibre core into the inner fibre core due to the SRS amplification is adjusted by means of the coupled-in power of the control signal laser beam (SS) to adjust the brilliance of the machining laser beam leaving the SRS amplifier fibre.

Abstract: A method for forming a carbon-metal composite material for a heat sink, comprising the following steps: applying at least one layer comprising carbon particles and at least one layer comprising metal particles on top of one another; and fusing of the layers by irradiating the layers with laser radiation to form the carbon-metal composite material. The invention also relates to a heat sink having a shaped body that comprises a plurality of layers, each layer containing carbon particles in a metal matrix.

Abstract: An optical fiber is designed to transmit high-power laser radiation. The optical fiber includes a fiber core, and an inner fiber cladding surrounding the fiber core, where the inner fiber cladding is configured to carry the laser radiation in the fiber core. The optical fiber also includes a first outer fiber cladding surrounding the inner fiber cladding. The first outer fiber cladding has a capillary-free longitudinal section and has a smaller refractive index than the refractive index of the inner fiber cladding. The optical fiber includes an outermost fiber cladding surrounding the first outer fiber cladding. The outermost fiber cladding has scattering centers that surround the capillary-free longitudinal section, where the scattering centers scatter laser radiation emerging from the inner fiber cladding through the first outer fiber cladding along the capillary-free section.

Abstract: In a laser device having at least one gas-purged laser resonator which is arranged in a purging gas circuit which has upstream of the laser resonator both a low pressure generator for generating a purging gas excess pressure in the purging gas circuit and, between the low pressure generator and the laser resonator, a cleaning device for cleaning the purging gas, the purging gas being air, according to the invention the purging gas circuit has downstream of the laser resonator between the laser resonator and the low pressure generator an intake opening which is permanently open towards the atmosphere, the purging gas pressure (p1) generated by the low pressure generator being greater than the atmospheric air pressure (p0).

Abstract: A pump light assembly (6) for a disc laser (1), comprising: a focusing device, in particular a concave mirror (11), having a reflecting surface (10) for focusing a pump light beam (8) onto a laser-active medium (2), and a deflecting assembly for deflecting the pump light beam (8) between reflecting regions formed on the reflecting surface (10) and disposed in different angular regions about a central axis (12) of the reflecting surface (10). The deflecting device is configured to produce a deflection of the pump light beam (8) between in each case two of the reflecting regions with an optical path length (2 f+2 d1; 2 f+2 d2) that is greater than the optical path length (2 f) in the case of telecentric imaging in order to compensate for a beam expansion of the pump light beam (8), caused by aberrations of the focusing device (11), in successive focusings onto the laser-active medium (2). The invention also relates to a disc laser (1) and to a method for pumping a laser-active medium (2).

Abstract: The invention relates to a device for adjusting a beam profile of a laser beam, which is guided in a light guide of a fiber optic cable provided with a protective sleeve, wherein the device comprises a deformation device for deforming the light guide in a section of the fiber optic cable not enclosed by the protective sleeve, a housing, which is designed to surround the light guide at least in the section not enclosed by the protective sleeve, and also two holders provided at opposite ends of the housing for fixing in each case one end of a section of the protective sleeve, wherein the holders each comprise an opening for feeding the light guide to the deformation device. The invention also relates to a laser processing machine having such a device and to an associated production method.

Abstract: A fiber-to-fiber coupling system includes: multiple optical input fibers, each optical input fiber having an exit-face on a light-exit side of the optical input fiber, in which the light-exit-sides are disposed around a central axis, and in which an optical axis extending through the light-exit side is tilted toward the central axis; an optical output fiber having an entry-face for receiving light; and an optical input-coupling device arranged to couple a light beam exiting from the end-face of each optical input fiber into the entry-face of the output fiber. The optical input-coupling device comprises, for each light beam exiting the exit surfaces of the optical input fibers, a single corresponding lens to transmit the light beam or a single corresponding ellipsoidal mirror to reflect the light beam.

Abstract: The invention relates to a device for adjusting a beam profile of a laser beam, which is guided in a light guide of a fibre optic cable provided with a protective sleeve, wherein the device comprises a deformation device for deforming the light guide in a section of the fibre optic cable not enclosed by the protective sleeve, a housing, which is designed to surround the light guide at least in the section not enclosed by the protective sleeve, and also two holders provided at opposite ends of the housing for fixing in each case one end of a section of the protective sleeve, wherein the holders each comprise an opening for feeding the light guide to the deformation device. The invention also relates to a laser processing machine having such a device and to an associated production method.

Abstract: The present invention relates to an optical insulator for high power optical radiation. The arrangement of the optical insulator comprises a Faraday rotator, comprising one or more Faraday media (4) and a magnet assembly (1) that allows for the receiving of multiple Faraday media (4). A polarizer assembly is arranged both in front of and behind the Faraday media (4). The magnet assembly (1) is formed by magnets (2) shaped in such a way that at least the outer-lying magnets are parallelepiped. The free aperture (3) is surrounded by three magnetic levels (12, 12?, 12?).

Abstract: A method for laser fusion cutting of a metal workpiece including applying a laser beam to the workpiece, where a kerf is melted in the workpiece by the laser beam and a laser beam diameter in a working point is configured to expel molten material from the kerf without cutting gas.

Abstract: This invention relates generally to laser systems that produce UV light and their methods of use. The phase matching of the conversion process has a broad temperature bandwidth so that precise temperature stabilization is not necessary to obtain a stable efficiency and a non-deformed laser beam with fast power modulation at high energies.

Abstract: An optical beam switch includes at least one input optical wave guide, multiple output optical wave guides and an optical switching element for selectively switching a light beam guided in the at least one input optical wave guide to one of the output optical wave guides, in which the switching element is between the at least one input optical waveguide and the multiple output optical waveguides. The optical switching element includes a beam propagation element and an optical focusing system, where the beam propagation element has two mutually opposed end faces and where either the beam propagation element or the optical focusing system can be deflected and/or twisted transversely to an optical axis. The at least one input optical wave guide is attached to a first end face of the beam propagation element, and the output optical wave guides are attached to a second end face.

Abstract: A diode laser structure includes multiple stripe emitters disposed next to each other, in which each of the stripe emitters is configured to emit, during operation, a laser beam having a corresponding beam parameter product with respect to a slow axis (BPPSA), where the stripe emitters are arranged such that the corresponding BPPSA of the laser beams successively decrease from a center of the diode laser structure towards a first edge of the diode laser structure and from the center of the diode laser structure towards a second edge of the diode laser structure, the second edge being opposite the first edge. The stripe emitters are oriented in a direction of the slow axis and are offset from one another in the direction of the slow axis.