Freiburg 2024 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 13: Interaction with Strong or Short Laser Pulses II (joint session A/MO)

MO 13.5: Vortrag

Mittwoch, 13. März 2024, 15:30–15:45, HS 1010

Observing Laser-Induced Plasma Dynamics by Time-Resolved Coherent-Diffractive-Imaging — •Tom Böttcher, Richard Altenkirch, Christian Peltz, Thomas Fennel, Franziska Fennel, and Stefan Lochbrunner — University of Rostock, Institute of Physics, Albert-Einstein-Str. 23, 18059 Rostock

Resolving the excitation and relaxation dynamics of laser-induced solid state plasmas is crucial for a fundamental understanding of the response of condensed matter targets to intense laser radiation. Knowledge about the influence of laser parameters like the spatial, temporal and spectral pulse structure on the plasma dynamics is essential for taylored laser machining applications. We present a method for observing the plasma dynamics in laser-excited thin gold foils using single-shot pump-probe coherent diffractive imaging. By employing a phase retrieval algorithm, we can reconstruct the 2D-spatial and time resolved complex transmission from recorded diffraction patterns. Our targets are 30 nm thick, free-standing gold foils that are excited by a focused femtosecond (fs)-800 nm pump pulse and subsequently imaged by a low intensity fs-400 nm pulse. The plasma dynamics are monitored on a time scale from 50 fs to 2 ns giving access to the ultrafast excitation (fs-ps regime) as well as the melting and ablation (ps-ns regime) dynamics.

Keywords: laser plasmas; coherent diffractive imaging; in-line-holography