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

Max-planck-gesellschaft Zur Forderung Der Wissenschaften E.v.

Rwth Aachen

Johannes Weitenberg

Peter Russbueldt

Thomas Sartorius

Thomas Udem

Joachim Pupeza

Peter Russbuldt

Andreas Vernaleken

Jan Schulte

Guido Rotarius

Hans-Dieter Hoffmann

Peter Zimmermann

Dominik Esser

Peter RUSSBÜLDT

A method and an arrangement of spectrally broadening laser pulses for non-linear pulse compression is disclosed which is based on the transition from the spectral broadening in a waveguide to the spectral broadening in a suitably shaped lens conductor. The arrangement is non-sensitive with respect to the variations of the pulse power, the position and parameters of the laser beam. The spectrally broadened pulses can be compressed in a satisfactory manner and the quality of the laser beam maintained by dividing the non-linear phase required for spectral broadening into sufficiently smaller steps which can be separated without non-linearity by suitable prorogation. The limitation of the pulse powers to less than the critical power of dielectrics is thus overcome and a pulse energy range for which the spectral broadening in the glass fibers cannot be used, is developed. The arrangement can compress pulses having a large average power.

Method and arrangement for spectral broadening of laser pulses for non-linear pulse compression

An optically end-pumped amplifier with a plate-shaped optical gain medium has a plurality of pump laser units for optically pumping the gain medium through at least one of the narrow side surfaces thereof. The pump laser units are designed such that the pump laser radiation, upon passing through the gain medium, has an elongated beam cross section having a short axis and a long axis running parallel to the main surfaces of the gain medium and propagates freely through the gain medium with respect to the short axis. They are arranged such that in each case the principal axes of the beam bundles of the pump laser units impinge on one of the pumped side surfaces in a plane perpendicular to the short axis at an angle to one another, wherein the beam cross sections of the beam bundles are superimposed on one another.

Optically end-pumped slab amplifier comprising pump modules arranged in a distributed manner

The present invention relates to a stable optical cavity, in which an obstacle is formed or arranged on the optical axis in the form of a through-opening in one of the mirrors or of an input- or output-coupling element, in order to enable a direct geometric access to the optical axis. The mirrors of the cavity are arranged such that a degeneracy of a plurality of transverse eigenmodes of the cavity occurs without an obstacle, by the combination of which an intensity minimum is obtained in the cavity with an obstacle at the position of the through-opening or of the input- or output-coupling element. With this configuration an optical cavity of high finesse which has a position of maximum intensity on the optical axis can be realized.

Optical resonator with direct geometric access to the optical axis

Growing community of inventors

Aachen, Germany

Johannes Weitenberg