@inproceedings{HeuckWittrockFilsetal.2007,
  author    = {Heuck, Hans-Martin and Wittrock, Ulrich and Fils, J{\´e}rome and Borneis, Stefan and Witte, Klaus and Eisenbart, Udo and Javorkova, Dasa and Bagnoud, Vincent and G{\"o}tte, Stefan and Tauschwitz, Andreas and Onkels, Eckehard},
  title     = {Adaptive optics at the PHELIX laser},
  series = {Adaptive Optics for Laser Systems and Other Applications, Proc. SPIE},
  volume    = {6584},
  booktitle = {Adaptive Optics for Laser Systems and Other Applications, Proc. SPIE},
  publisher = {SPIE},
  doi       = {10.25974/fhms-621},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6215},
  pages     = {658402},
  year      = {2007},
  abstract  = {GSI Darmstadt currently builds a high-energy petawatt Nd:glass laser system, called PHELIX (Petawatt High-Energy Laser for Heavy-Ion Experiments). PHELIX will offer the world-wide unique combination of a high current, high-energy heavy-ion beam with an intense laser beam. Aberrations due to the beam transport and due to the amplification process limit the focusability and the intensity at the target. We have investigated the aberrations of the different amplification stages. The pre-amplifier stage consists of three rod-amplifiers which cause mainly defocus, but also a small part of coma and astigmatism. The main amplifier consists of five disk amplifiers with a clear aperture of 315 mm. These large disk-amplifiers cause pump-shot aberrations which occur instantly. After a shot, the disk amplifiers need a cooling time of several hours to relax to their initial state. This limits the repetition rate and causes long-term aberrations. We will present first measurements of the pump-shot and long-term aberrations caused by the pre- and the main amplifier in a single-pass configuration. In this context, we will present the adaptive optics system which is implemented in the PHELIX beam line and discuss its capability to compensate for the pump-shot and long-term aberrations.},
  language  = {de}
}
@article{HeuckNeumayerKuehletal.2006,
  author    = {Heuck, Hans-Martin and Neumayer, Paul and K{\"u}hl, Thomas and Wittrock, Ulrich},
  title     = {Chromatic aberration in petawatt-class lasers},
  series = {Appl. Phys. B},
  volume    = {84},
  journal   = {Appl. Phys. B},
  publisher = {Springer},
  doi       = {10.25974/fhms-652},
  url       = {http://nbn-resolving.de/urn:nbn:de:hbz:836-opus-6523},
  pages     = {421 -- 428},
  year      = {2006},
  abstract  = {In order to avoid optical damage and non-linear effects, high-power, high-energy lasers of the petawatt class like PHELIX (petawatt high-energy laser for heavy-ion experiments) use large-aperture optics. Usually, chromatic aberration associated with these optical elements is neglected. By means of numerical simulations, we show how the chromatic aberration affects the focal intensity pattern. In particular, we make quantitative predictions of how chromatic aberration decreases the focused peak intensity. Furthermore, we prove the feasibility of a new interferometer that measures the temporal pulse front distortions which arise from expansion telescopes. We also propose a scheme that pre-compensates these distortions.},
  language  = {en}
}