Erlangen 2018 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 6: Poster
K 6.3: Poster
Wednesday, March 7, 2018, 16:15–18:15, Orangerie
Time resolved coherent lensless imaging of plasma dynamics — •Elisa Appi1, Ahmed Maghraoui2, Willem Boutu2, Hamed Merdji2, and Milutin Kovacev1 — 1Institut für Quantenoptik, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover — 2LIDYL Laboratory CEA-Saclay, 91191 Gif-sur-Yvette, France
Coherent lensless imaging is a powerful technique that offers spatial resolution at the order of the wavelength, thanks to the fact that no optical elements are required. The capability of imaging objects with nanometric spatial resolution and on femtosecond time scales in a single shot mode has been demonstrated [1]. Here we present a pump-probe setup to perform coherent diffractive imaging with time resolution from the few-femtosecond scale up to nanoseconds to measure the laser driven plasma dynamics in for example Titanium spheres. After the interaction with an ultrashort pump pulse which enables the dynamics, the samples are illuminated by an intense XUV coherent beam with high photon flux. Using the technique of holography with extended references (HERALDO) it is possible reconstruct the final image from the recorded diffraction patter in a more efficient way [2] than standard Fourier transform holography. The temporal resolution should allow to observe the very early stage of the plasma heating, phase transitions and plasma expansion which conventional light microscopy techniques cannot resolve.
[1] A. Ravasio et al., Phys. Rev. Lett. 103, 028104 (2009).
[2] D. Gauthier et al., Phys. Rev. Lett. 105, 093901 (2010).