1. Few-femtosecond resolved imaging of laser-driven nanoplasma expansion
- Author
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Peltz, C., Powell, J. A., Rupp, P., Summers, A, Gorkhover, T., Gallei, M., Halfpap, I., Antonsson, E., Langer, B., Trallero-Herrero, C., Graf, C., Ray, D., Liu, Q., Osipov, T., Bucher, M., Ferguson, K., Möller, S., Zherebtsov, S., Rolles, D., Rühl, E., Coslovich, G., Coffee, R. N., Bostedt, C., Rudenko, A., Kling, M. F., and Fennel, T.
- Subjects
Physics - Plasma Physics - Abstract
The free expansion of a planar plasma surface is a fundamental non-equilibrium process relevant for various fields but as-yet experimentally still difficult to capture. The significance of the associated spatiotemporal plasma motion ranges from astrophysics and controlled fusion to laser machining, surface high-harmonic generation, plasma mirrors, and laser-particle acceleration. Here, we show that x-ray coherent diffractive imaging can surpass existing approaches and enables the quantitative real-time analysis of the sudden free expansion of nanoplasmas. For laser-ionized SiO$_2$ nanospheres, we resolve the formation of the emerging nearly self-similar plasma profile evolution and expose the so far inaccessible shell-wise expansion dynamics including the associated startup delay and rarefaction front velocity. Our results establish time-resolved diffractive imaging as an accurate quantitative diagnostic platform for tracing and characterizing plasma expansion and indicate the possibility to resolve various laser-driven processes including shock formation and wave-breaking phenomena with unprecedented resolution.
- Published
- 2021
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