Abstract

A thin-disk regenerative amplifier based on Yb-doped potassium yttrium tungstate is operated at 40kHz with an output pulse energy of 116μJ and a pulse duration of 250fs. Dispersive stretching of the pulse during amplification instead of an external stretcher is used to avoid high peak intensities. The small amount of the laser active material in the amplifier inherent for the thin-disk laser design and a large beam radius in the Pockels cell reduce nonlinear effects further. Consequently the output pulses can be compressed to 250fs using a pair of diffraction gratings.

© 2007 Optical Society of America

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