Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V.

Peter Loosen

Keming Du

Reinhart Poprawe

Gerd Herziger

Dirk Petring

Hans-Georg Treusch

Alexander J Drenker

Konstantin Boucke

Hartwig Boning

Volker Sturm

Joachim Franek

Otto Marten

The invention relates to a resonator system with at least two folding elements for folding the beam path. Said folding elements serve to restrict the divergence angle of the radiation. The inventive resonator system is further characterized in that the respective folding is caused by reflection on a reflecting surface of the respective folding element. The beam axis of the radiation and the surface normal of the respective reflecting area are positioned at an angle relative to each other that is greater than the critical angle for the total reflection but smaller than the sum of the critical angle for the total reflection plus the divergence angle of the radiation.

Resonator system with at least two folding elements

An optical amplifier arrangement, including an amplifying medium, which exhibits an approximately rectangular cross section with a long edge and a short edge, as well as at least two highly reflecting mirrors, between which the amplifying medium is disposed, whereby the long or the short edge of the cross section is along the X axis or the Y axis; the Z axis is the optical axis; and the X, Y and Z axis form a rectangular coordinate system. The mirrors are designed and arranged in such a manner that one beam, which is to be amplified and beamed in by an oscillator, passes repeatedly through the amplifying medium in the XZ plane and is amplified; and the size of the beam to be amplified in the X direction becomes larger after each passage.

Optical amplifier arrangement for a solid state laser

A method for processing moving workpieces with laser radiation that is focused on a to-be-processed workpiece surface by means of a laser beam that is moved but not relative to the workpiece. The laser beam is focused in a line-like manner and its beam spot corresponds practically exclusively and with full a real coverage to the work piece surface to be processed.

Method and device for treating work pieces with laser radiation

An arrangement is disclosed for geometrically shaping a radiation field, in particular the radiation field of a diode laser array which propagates in the z direction and has a radiation cross section which is larger, in a direction defined as the y direction, which is perpendicular to the first, and has a lower radiation quality in said direction. X, y and z form a Cartesian coordinate system. The radiation is grouped into radiation fractions in the x direction and the radiation fractions are reoriented as regards their radiation cross sections. The arrangement has at least two reflective elements (,) and is characterized in that each reflective element has a pair of reflection surfaces (,) at approximately or exactly 90&deg; to each other. This opening angle (,) is oriented against the direction of propagation. The line (,) at which the reflection surfaces intersect is oriented at approximately below 45&deg; to the x direction.

Device with at least one beam source and an arrangement for geometric reshaping of the radiation field emitted by the beam source

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Aachen, Germany

Peter Loosen