Hannover 2016 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 19: Poster Session- Laser Plasmas
P 19.3: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
Time-Resolved In-Line-Holography for Observing Laser Plasmas — •Hannes Bassen1, Neeke Rothe1, Christoph Merschjann2, Franziska Fennel1, and Stefan Lochbrunner1 — 1Universtität Rostock, D-18059 Rostock, Germany — 2Freie Universität Berlin, D-14195 Berlin, Germany
Dense laser-induced plasmas attract strong scientific interest. They are crucial in understanding the interaction between condensed matter and intense laser radiation as well as in providing an elegant and powerful approach to study warm dense matter. Here we focus on the experimental setup to detect diffraction patterns created by dense plasmas with a radius of about 30 µm in a thin gold foil. This results from the interaction of the foil with an intense, ultrashort pump laser pulse, which creates a dense plasma and finally leaves a hole. Using a temporally shifted and frequency doubled probe pulse we are able to gather the caused diffraction pattern with a CCD camera. Afterwards we can obtain information about structure, transmittance and phase at a certain delay by using an iterative algorithm based on the angular spectrum method: We implemented the phase retrieval algorithm and additionally use a hybrid-input-output algorithm, which keeps feedback information from previous iterations. To ensure convergence and fewer artifacts in the reconstruction we also restrict the plasma area regularly by applying a shrink-wrap mask. Comparison of images reconstructed from diffraction patterns of holes in the gold foil with REM images shows perfect match. The method allows to reconstruct the spatially resolved plasma dynamics.