SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 3: Interaction with Strong or Short Laser Pulses I (joint session A/MO)

MO 3.4: Vortrag

Montag, 6. März 2023, 12:00–12:15, F303

Holographic Single-Shot Imaging and Reconstruction of ultrafast laser-driven dynamics in thin films — •Richard Altenkirch, Franziska Fennel, Christian Peltz, Thomas Fennel, and Stefan Lochbrunner — Institute of Physics, Universität Rostock, Germany

Well controlled laser material processing with a spatial resolution on the scale of the laser wavelength is significant to a large variety of both research and industrial applications. A full characterization of the spatial and temporal evolution of the ultrafast laser-induced plasma dynamics will be key to future developments in the respective fields. So far, the established diagnostic methods are mostly sensitive to the target absorption and luminescence. Here, we present an experimental and numerical approach based on coherent diffractive imaging (CDI), a technique well known from free particle characterization at XFEL’s [1], also providing access to the phase delay caused by the target. In a two-color pump-probe experiment, a thin film is excited by a short pump pulse and the resulting plasma dynamics are imaged by a frequency doubled probe pulse. The corresponding complex near field behind the target is reconstructed from the recorded scattering image via a phase retrieval approach [2]. We also present a thorough characterization of the method and a first successful application to experimental data.

[1] H. Chapman et al., Nature Physics 2 839-843 (2006)

[2] J. Fienup, Appl. Opt. 21, 2758-2769 (1982)