Würzburg 2018 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: New Accelerator Concepts
AKBP 2.8: Vortrag
Montag, 19. März 2018, 17:45–18:00, NW-Bau - HS2
Wavefront Degradation of a 200 TW Laser from Heat-Induced Deformation of In-Vacuum Compressor Gratings — •Vincent Leroux1,2, Timo Eichner1, Sören Jalas1, Spencer W. Jolly1,2, Manuel Kirchen1, Philipp Messner1,3, Matthias Schnepp1, Christian Werle1, Paul Winkler1,4, and Andreas R. Maier1 — 1Center for Free-Electron Laser Science, Hamburg, Germany — 2ELI Beamlines, Dolní Břežany, Czech Republic — 3Max-Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany — 4DESY, Hamburg, Germany
Laser-plasma accelerators are driven by hundreds terawat or up to petawatt laser systems, at a few Hz repetition rates. Furthermore, as the laser technology pushes forward the average power limit, the absorbed heat into the gold-coated in-vacuum compressor gratings increases. This heat leads to deformations of the grating surface which changes the spatial properties of the laser beam during high-power operation. We report the direct measurement of heat-induced wavefront distortion in gold-coated gratings of a 200 TW vacuum compressor using the actual high-energy ultrashort laser to both heat up the gratings and diagnose their deformations. Input energy and laser repetition rate are scanned to cover a wide range of average power, and the degraded wavefront are analyzed to assess the evolution of the laser beam focusability.