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

Keming Du

Peter Loosen

Reinhart Poprawe

Gerd Herziger

Konstantin Boucke

Uwe Habich

Heinz-Dieter Plum

Junguan Shen

Joachim Franek

An optical arrangement for enlarging spectral bandwidths by nonlinear self-phase modulation for shortening ultrashort pulses using a multipass cell and a nonlinear medium. The nonlinear medium is arranged within the multipass cell, and a laser beam having ultrashort pulses passes through the nonlinear medium multiple times. The laser beam is coupled into the multipass cell by way of a shaping optical unit. The laser beam is shaped into an astigmatic beam and coupled into the multipass cell by way of the shaping optical unit.

Optical assembly for enlarging spectral bandwidths and reducing ultrashort pulses

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

Optically pumped amplifiers, in particular solid-state amplifiers, comprise an amplification medium ( ) and an optical pumping arrangement ( ) via which the pumping radiation is coupled to the amplification medium ( ), the pumping radiation being formed before coupling. The volume of the amplification medium is only partially pumped; the pumped volume of the amplification medium is approximately rectangular in cross-section and approximately perpendicular to the optical axis; and the ratio of the width to height of the rectangular cross-section is greater than 1:8.

Optically pumped intensifying agent, in particular a solid intensifying agent

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

Process and device for forming and guiding the radiation field of one or

Device for providing the cross-section of the radiation emitted by

Arrangement for guiding and shaping beams from a rectilinear laser diode

A laser resonant cavity for utilizing media, having an annular cross sect as well as two end mirrors. The end mirrors exhibit a toroidal surface, and at least one end mirror has at least one aperture through which the laser beam can be coupled out.

Laser cavity for laser media with annular cross section

Laser resonator

Aerodynamic window for a gas laser

An aerodynamic window for gas lasers, has an active chamber with a beam penetration opening free of solids. An end of a beam duct is connected to the beam penetration opening and is transversely penetrated by a nozzle duct of a gas flow window through which compressed gas can flow. A beam outlet opening delivers a laser beam to an exterior space which is preferably at atmospheric pressure. A suction chamber of a differential pump is provided between the other end of the beam duct and the beam outlet opening, and the working pressure of the differential pump is approximately equal to the pressure in the other end of the beam duct on the suction chamber side.

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Aachen, Germany

Keming Du