SAMOP 2021 – scientific programme

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A: Fachverband Atomphysik

A 9: Interaction with strong or short laser pulses

A 9.6: Poster

Tuesday, September 21, 2021, 16:30–18:30, P

Imaging ultrafast laser-driven dynamics in thin foils via in-line holography — •Richard Altenkirch, Christian Peltz, Franziska Fennel, Stefan Lochbrunner, and Thomas Fennel — Institute for Physics, Rostock, Germany

Well controlled laser material processing with a spatial resolution on the scale of the laser wavelength is key to the realization of a large variety of applications. Respective developments will strongly benefit from a full spatial and temporal characterization of the laser-induced plasma evolution. To this end, we implemented an experiment based on coherent diffractive imaging (CDI), a technique well known from free particle characterization using XUVs and Xrays [1]. The probe pulse images the spatial plasma profile evolution induced by the pump pulse in a thin gold foil. The resulting scattering images are used for a reconstruction via phase retrieval [2]. In contrast to typical Xray CDI experiments, we record a superposition of scattered radiation and the radiation transmitted through the intact foil, leading to holographic signatures. Here, we present a systematic numerical analysis of the role of these holographic features for the object reconstruction as well as the optimal experimental conditions. We further present a first successful application of the reconstruction method to experimental data, i.e. laser-drilled holes.

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

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