Patents Assigned to Rofin-Sinar Laser GmbH
  • Patent number: 5751750
    Abstract: A laser system with compensated optics contains at least one optical element which is thermally coupled to a heat source in order to thermally compensate for a deformation of optical elements disposed in a beam path of the laser system. The deformation is brought about by the laser beam.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: May 12, 1998
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Dirk Friede, Hermann Hage, Karl-Heinz Herzner, Volker Scholz
  • Patent number: 5619602
    Abstract: An optical fiber cable for high power laser radiation transmission comprises a fiber having a core and a surrounding cladding, a rod provided at at least one of contact ends of the core and fused to an end surface of the core the rod having larger diameter than that of the core, and a reflector provided at this end of the fiber, the rod being designed to conduct rays entering outside the fiber towards an area where they can be absorbed without causing any damage, to conduct rays not linked into the fiber towards the reflector.
    Type: Grant
    Filed: November 1, 1995
    Date of Patent: April 8, 1997
    Assignees: Permanova Laser System AB, Rofin-Sinar Laser GmbH
    Inventors: Ulf Sandstrom, Sven-Olov Roos, Kennet Vilhelmsson
  • Patent number: 5497442
    Abstract: An optical fiber for high-power laser transmission is formed of a glass fiber with a fiber core and a fiber cladding surrounding the fiber core. An intermediate layer of polymer is disposed on the fiber cladding, a metallic coating of film is disposed on the intermediate layer, and the metallic coating is protected against mechanically induced damage with an outer jacket. The operational condition of the optical fiber is monitored in that the electrical resistance across the metallic coating is measured along the optical fiber. When the resistance exceeds a predetermined threshold value, the laser radiation is prevented from entering the optical fiber, preferably with a shutter.
    Type: Grant
    Filed: August 19, 1994
    Date of Patent: March 5, 1996
    Assignee: Rofin Sinar Laser GmbH
    Inventors: Sven-Olov Roos, Reinhold Dinger, Klaus Ludewigt
  • Patent number: 5353299
    Abstract: An electrically excited gas laser includes coaxial hollow-cylindrical electrodes defining a discharge space between the electrodes. A resonator mirror is disposed at each respective end of the discharge space. At least one of the resonator mirrors forms an intersection line with a cylindrical surface being coaxial with the electrodes and the intersection line extends obliquely relative to the circumferential direction. The resonator mirrors form intersection lines with an axial plane of the electrodes and the intersection lines extend substantially at right angles to the axis. At least one of the resonator mirrors extends over only a portion of the circumference of the discharge space.
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: October 4, 1994
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Hinrich Martinen, Hermann Hage
  • Patent number: 5212708
    Abstract: In an axial flow gas laser, in particular a high-power CO.sub.2 laser with DC excitation, at least one discharge tube (1) of dielectric material, in particular quartz glass, is provided. First and second connection bodies (E1, E2) are sealingly connected to the discharge tube (1) or to connection necks branching off from it, in each case in the vicinity of an electrical and laser gas connection point, forming a connection chamber (K1, K2), and are connected to laser gas inlet lines (4) or outlet lines (9). The first connection body (E1) is connected to the anode potential and the second connection body (E2) to the cathode potential of a direct voltage source. The first and second connection bodies (E1, E2) are disposed with tubular axial spacing from one another, so that the discharge tube (1), with its gas chamber, forms a discharge path between the anode and cathode potentials.
    Type: Grant
    Filed: May 29, 1990
    Date of Patent: May 18, 1993
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Klaus Schanz, Wolfgang Wurst
  • Patent number: 5200971
    Abstract: In order to improve a high-frequency excited gas laser with longitudinal flow, comprising a discharge channel having laser gas flowing therethrough in a direction of flow and high-frequency electrodes arranged on both sides of the discharge channel for generating a high-frequency discharge transversely to the direction of flow, such that a high output can be achieved with this laser in a manner which is, constructionally, as simple as possible and that its design is, at the same time, as compact as possible, it is suggested that the discharge channel comprise a plurality of channel elements, the channel axes of which are aligned parallel to one another in the direction of flow, that the channel elements be arranged beside or next to one another in a direction of installation transverse to the direction of flow and that the channel elements have a cross section having a greater extension in a first cross direction at right angles to the direction of flow than in a second cross direction extending at right angl
    Type: Grant
    Filed: January 23, 1992
    Date of Patent: April 6, 1993
    Assignees: Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V., Rofin-Sinar Laser GmbH
    Inventors: Eberhard Wildermuth, Hartwig Von Buelow, Wolfram Schock, Joerg Porath, Klaus Schanz
  • Patent number: 5008896
    Abstract: The invention relates to a gas laser having a discharge tube, through which the gas flows in an aixal direction and to which high-frequency electrodes are fitted externally, and having a high-frequency generator. In order to obtain a simpler construction and the smallest possible high-frequency losses, it is provided that the power output stage (12) of the high-frequency generator is disposed in the housing (1) of the laser resonator (2, 7, 8) and is directly connected to the electrodes (9, 10) via impedance adaptation elements (11).
    Type: Grant
    Filed: April 10, 1987
    Date of Patent: April 16, 1991
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Hinrich Martinen, Karl-Heinz Knobbe, Samuel S. Simonsson, Peter Wirth
  • Patent number: 4839496
    Abstract: The laser welding device for welding hollow sections (1) and flat sections which are to be welded flush to one another, having a detection device (7) for one or both edges to be welded and having a tracking device (7, 8) for the welding head which is adjustable transversely to the direction of the weld seam, is characterized in that it exhibits deflecting mirrors (10, 11) for the laser light which are disposed obliquely in relation to the laser beam axis (9) and which are pivotable about this axis (9), in that the detection device is designed as a mechanical scanner (7), and in that the scanner (7) and the deflecting mirrors (10, 11) are connected to one another for common pivoting movement (FIG. 1).
    Type: Grant
    Filed: September 29, 1988
    Date of Patent: June 13, 1989
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Karl-Heinz Armier, Bernhard Muller
  • Patent number: 4807236
    Abstract: The gas laser with high-frequency excitation exhibits a laser tube (1), to which at least one pair of electrodes (5, 6) for the high-frequency excitation is externally fitted, and at least one inlet connection (2) and one outlet connection (3) for the gas. In order to permit a shorter distance between the pair of electrodes (5, 6) and the outlet connection (3), it is provided that a disc (12) having a high dielectric constant is disposed on the tube (1) between the pair of electrodes (5, 6) and the outlet connection (3), which disc extends substantially perpendicular to the axis of the tube.
    Type: Grant
    Filed: July 13, 1987
    Date of Patent: February 21, 1989
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Hinrich Martinen, Samuel Simonsson, Peter Wirth
  • Patent number: 4723063
    Abstract: The laser welding apparatus has a nozzle (10) for generating a transversely extending gas current (14) between the optical system (4, 5, 6) and the beam focus for the deflection of particles moving in a direction towards the optical system (4, 5, 6). In order to reduce the level of noise development and to improve the protective action of the gas current curtain (14), the receiving aperture (12) of a gas exhaust line (13) is disposed opposite the nozzle (10), and furthermore the nozzle (10) is provided within an injector envelope (11), which forms together with the gas exhaust line (13) a substantially continuous flow channel.
    Type: Grant
    Filed: March 27, 1986
    Date of Patent: February 2, 1988
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Karl-Heinz Armier, Bernd Ladiges
  • Patent number: 4610014
    Abstract: Gas flow laser, in particular a laser through which the gas flows transversely, or through which it flow rapidly in an axial direction, which possesses a main gas circuit embracing the resonator and a circulating pump, together with an auxiliary circuit for continuously bleeding-off, conditioning and reintroducing a partial stream of the gas. The cost of the auxiliary circuit is reduced by connecting it to the main circuit upstream and downstream of the circulating pump, so that the full delivery head by the circulating pump is available for operating the auxiliary circuit. The supply of fresh gas can be introduced independently of the auxiliary circuit.
    Type: Grant
    Filed: January 30, 1984
    Date of Patent: September 2, 1986
    Assignee: Rofin-Sinar Laser GmbH
    Inventors: Hinrich Martinen, Samuel S. Simonsson, Peter Wirth