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Understanding Intense Laser Interactions with Solid Density Plasma

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Technical Report,01 Sep 2012,31 Aug 2016

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University of Michigan Ann Arbor United States

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We have performed time resolved measurements of the interaction of an ultrafast laser with thin solid density foil using wakefield accelerated electrons. Recent progress in laser wakefield acceleration has led to the emergence of a new generation of electron and X-ray sources that may have enormous benefits for ultrafast science. These novel sources promise to become indispensable tools for the investigation of structural dynamics on the femtosecond time scale, with spatial resolution on the atomic scale. We have demonstrated for the first time the use of laser-wakefield-accelerated electron bunches for time-resolved electron diffraction measurements of the structural dynamics of single-crystal silicon nano-membranes pumped by an ultrafast laser pulse. In our proof-of-concept study, we resolve the silicon lattice dynamics on a picosecond time scale by deflecting the momentum-time correlated electrons in the diffraction peaks with a static magnetic field to obtain the time-dependent diffraction efficiency. Further improvements may lead to femtosecond temporal resolution, with negligible pump-probe jitter being possible with future laser-wakefield-accelerator ultrafast-electron-diffraction schemes. Z.-H. He, et al. A. G. R. Thomas and J. Faure, Capturing Structural Dynamics in Crystalline Silicon Using Chirped Electrons from a Laser Wakefield Accelerator Scientific Reports Accepted 2016.

Subject Categories:

  • Plasma Physics and Magnetohydrodynamics

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