Wuppertal 2015 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Poster
AKBP 5.19: Poster
Dienstag, 10. März 2015, 11:00–19:00, Foyer Ebene G.10
Femtosecond laser micromachining of sapphire capillaries for laser-wakefield acceleration — •Philipp Messner1,2, Niels Matthias Delbos1,2, Thomas Calmano2, and Andreas R. Maier1,2 — 1CFEL, Center for Free-Electron Laser Science, 22607 Hamburg — 2University of Hamburg, Institute of Experimental Physics, 22761 Hamburg
Laser-plasma accelerator are promising candidates to provide ultra-relativistic electron beams for compact light sources. One factor that limits the achievable electron beam energy in a laser plasma accelerator is the Rayleigh length of the driver laser, which dictates the length over which the electron beams can effectively be accelerated. To overcome this limitation lasers can be guided in a capillary waveguide to extend the acceleration length beyond the Rayleigh length. The production of waveguide structures on scales, that are suitable for plasma acceleration is very challenging. Here, we present experimental results from waveguide machining in sapphire crystals using a Clark MXR CPA 2010 laser with a wavelength of 775nm, 1KHZ repetition rate and a pulse duration of 160 fs. We discuss the effects of different parameters like energy, lens types, writing speed and polarisation on the size and shape of the capillaries, and compare the performance of different parameter sets.