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Implementation of a phase plate for the generation of homogeneous focal-spot intensity distributions at the high-energy short-pulse laser facility PHELIX

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High Power Laser Science and Engineering 2019年第4期7卷 33-38页

作者： V.Bagnoud J.Hornung M.Afshari u.eisenbarth C.Brabetz Z.Major B.Zielbauer GSI Helmholtzzentrum fur Schwerionenforschung GmbH Planckstrasse 164291 DarmstadtGermany Helmholtz Institute Jena Frobelstieg 307743 JenaGermany

We propose and demonstrate the use of random phase plates(RPPs)for high-energy sub-picosecond *** to previous work related to nanosecond lasers,an RPP poses technical challenges with ultrashort-pulse ***,we implement the RPP near the beginning of the amplifier and image-relay it throughout the laser *** this,we obtain a uniform intensity distribution in the focus over an area 1600 times the diffraction *** method shows no significant drawbacks for the laser and it has been implemented at the PHELIX laser facility where it is now available for users.

关键词： beam shaping high-power laser phase plate short-pulse laser

ultra-compact post-compressor on-shot wavefront measurement for beam correction at PHELIX

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High Power Laser Science and Engineering 2022年第3期10卷 2-10页

作者： J.B.Ohland u.eisenbarth B.Zielbauer Y.Zobus D.Posor J.Hornung D.Reemts V.Bagnoud GSI Helmholtzzentrum für Schwerionenforschung 64291DarmstadtGermany Institute for Applied Physics Technische Universität Darmstadt64289 DarmstadtGermany Institute of Nuclear Physics Technische Universität Darmstadt64289 DarmstadtGermany Helmholtz-Institut Jena 07743 JenaGermany

In order to reach the highest intensities,modern laser systems use adaptive optics to control their beam ***,the focal spot is optimized after the compression stage of the system in order to avoid spatio-temporal *** also requires a wavefront sensor after the compressor,which should be able to measure the wavefront *** PHELIX,we have developed an ultra-compact post-compressor beam diagnostic due to strict space constraints,measuring the wavefront over the full aperture of 28 *** system features all-reflective imaging beam transport and a high dynamic range in order to measure the wavefront in alignment mode as well as on shot.

关键词： adaptive optics beam quality high intensity laser diagnostics on shot Strehl wavefront

Enhancement of the laser-driven proton source at PHELIX

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High Power Laser Science and Engineering 2020年第2期8卷 153-160页

作者： J.Hornung Y.Zobus P.Boller C.Brabetz u.eisenbarth T.Kühl Zs.Major J.B.Ohl M.Zepf B.Zielbauer V.Bagnoud GSI Helmholtzzentrum fur Schwerionenforschung GmbH Planckstraße 164291 DarmstadtGermany Friedrich-Schiller-universitat Fürstengraben 107743 JenaGermany Helmholtz-Institut Jena Frobelstieg 307743 JenaGermany Technische universitat Darmstadt Karolinenplatz 564289 DarmstadtGermany Johannes Gutenberg university MainzSaarstraße 2155122 MainzGermany

We present a study of laser-driven ion acceleration with micrometre and sub-micrometre thick targets,which focuses on the enhancement of the maximum proton energy and the total number of accelerated particles at the PHELIX *** laser pulses with a nanosecond temporal contrast of up to 10^-12 and an intensity of the order of 1020 W/cm^2,proton energies up to 93 MeV are ***,the conversion efficiency at 45°incidence angle was increased when changing the laser polarization to p,enabling similar proton energies and particle numbers as in the case of normal incidence and s-polarization,but reducing the debris on the last focusing optic.

关键词： high power laser proton acceleration secondary sources

High-energy laser facility PHELIX at GSI:latest advances and extended capabilities

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High Power Laser Science and Engineering 2024年第4期12卷 9-23页

作者： Zs.Major u.eisenbarth B.Zielbauer C.Brabetz J.B.Ohland Y.Zobus S.Roeder D.Reemts S.Kunzer S.Götte D.Neidherr J.Hornung P.Kewes D.Schumacher D.Beck P.Hesselbach M.Malki P.Neumayer K.Weyrich A.Tauschwitz V.Bagnoud GSI Helmholtzzentrum für Schwerionenforschung GmbH DarmstadtGermany Helmholtz-Institut Jena JenaGermany Laboratoire pour I’utilisation des Lasers Intenses Ecole PolytechniquePalaiseau CedexFrance Institut für angewandte Physik Technische Universität DarmstadtDarmstadtGermany Institut für angewandte Physik Goethe-Universität FrankfurtFrankfurt am MainGermany

The high-energy/high-intensity laser facility PHELIX of the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt,Germany,has been in operation since ***,we review the current system performance,which is the result of continuous development and further *** its versatile frontend architecture,PHELIX can be operated in both long-and short-pulse modes,corresponding to ns-pulses with up to 1 kJ pulse energy and sub-ps,200 J pulses,*** the short-pulse mode,the excellent temporal contrast and the control over the wavefront make PHELIX an ideal driver for secondary sources of high-energy ions,neutrons,electrons and *** long-pulse mode is mainly used for plasma heating,which can then be probed by the heavy-ion beam of the linear accelerator of *** addition,PHELIX can now be used to generate X-rays for studying exotic states of matter created by heavy-ion heating using the ion beam of the heavy-ion synchrotron of GSI.

关键词： beam quality combined high-energy-laser heavy-ion experiments high-energy lasers high-intensity lasers temporal contrast