Abstract: The invention relates to a method and an apparatus for the laser machining of workpieces, a laser beam being two-dimensionally positionable with the aid of a laser machining head with respect to a surface of a workpiece and it being intended for the machining of the workpiece to take place with predeterminable contours. According to the object, it is to be possible for the forming of the contours to be realized with high positional accuracy at low cost and with little effort. To achieve this object, the laser beam is correspondingly guided by means of a laser machining head, in which at least one two-dimensionally pivotable scanner mirror is accommodated. The scanner mirror or two scanner mirrors is/are connected to an electronic evaluation and control unit. Before the actual machining, a set-actual value comparison is carried out with respect to the position of the workpiece with at least one predetermined contour with respect to the laser machining head.

Abstract: The invention relates to a method and an apparatus for the laser machining of workpieces, a laser beam being two-dimensionally positionable with the aid of a laser machining head with respect to a surface of a workpiece and it being intended for the machining of the workpiece to take place with predeterminable contours. According to the object, it is to be possible for the forming of the contours to be realized with high positional accuracy at low cost and with little effort. To achieve this object, the laser beam is correspondingly guided by means of a laser machining head, in which at least one two-dimensionally pivotable scanner mirror is accommodated. The scanner mirror or two scanner mirrors is/are connected to an electronic evaluation and control unit. Before the actual machining, a set-actual value comparison is carried out with respect to the position of the workpiece with at least one predetermined contour with respect to the laser machining head.

Abstract: The invention relates to a device for laser beam shaping, and in particular to a device for laser beam surface machining. The device includes at least one stationary beam-shaping mirror and at least one rotary mirror that is rotatably supported about a rotational axis and can be selectively driven for rotation. As viewed in the direction of propagation of the laser beam, the at least one static beam shaping mirror is disposed first, followed by the at least one rotary mirror. A perpendicular to a beam deflecting surface of the rotary mirror is inclined at a particular angle relative to the rotational axis by a tapered disc. The tapered disc is fastened to the side of the rotary mirror remote from the laser beam to provide the desired angle of inclination, and the beam deflecting surface of the rotary mirror may be made smooth. One of the stationary and rotary mirrors is configured so that the resulting outline of the beam on the surface to be treated includes an ellipse.

Abstract: A fibrillated strand is made by a method wherein first a mass of a powder of a high polymer is compressed into a substrate having a density smaller than that of the high polymer and having a multiplicity of gas-filled voids. Then an intense heat beam is played on the substrate to melt the high-polymer powder and simultaneously heat the gas of the voids to explosively enlarge same while the beam and substrate are relatively displaced so that the substrate is melted along a path. The substrate is cooled at least at the path after irradiation by the beam to form a porous strand extending along the path in the substrate. This strand is separated from the substrate and is then at least uniaxially stretched. The beam is a CO.sub.2 TEM.sub.oo -mode laser beam and the method further comprises the step of focussing the laser beam on the substrate. The fused strand of the substrate is cooled so rapidly that it is normally not melted all the way through from top to bottom and from side to side.