Wuppertal 2015 – scientific programme
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 2: PWA / TNSA I
AKBP 2.5: Talk
Monday, March 9, 2015, 15:00–15:15, BZ.08.04 (HS 2)
Ion Acceleration at the POLARIS-Laser with ultra high Contrast and ultra thin Foils — •Jan Reislöhner1, Georg Becker1, Jens Polz1, Lennart Bock1, Andreas Seidel1, Stephan Kuschel1,2, Marco Hornung1,2, Hartmut Liebetrau1, Alexander Kessler1,2, Frank Schorcht2, Marco Hellwing1, Wenjun Ma3, Jianhui Bin3, Jörg Schreiber3,4, Matthew Zepf1,2, and Malte Kaluza1,2 — 1Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität Jena — 2Helmholtz-Institut Jena — 3Fakultät für Physik, LMU München — 4Max-Planck-Institut für Quantenoptik
The petawatt-class laser system POLARIS in Jena has been developed and continuously improved within the last two decades. For Laser induced ion acceleration the contrast of the laser is of crucial importance. The amplified spontaneous emission (ASE) and prepulses of high power lasers, such as POLARIS, create a preplasma on the target nanoseconds before the main pulse arrives. In the case of ultra thin foils with thicknesses of a few nanometers, it is essential that the main pulse ionizes the target. Therefore, the contrast was improved by adding an XPW stage in a double CPA setup. And it was further improved via second harmonic generation of the main laser pulses in a nonlinear crystal. The second harmonic pulses were then focused onto targets with thicknesses in the range of 5 nm to 1000 nm. The aim of this talk is to explain the experiment and to discuss the results.