Abstract
Ultrashort pulsed electron beams and X-rays were generated by femtosecond intense laser field and used for a time-resolved measurement of matter under shock compression. Time-resolved electron shadowgraphy measurement was performed involving the infrared picosecond ablation of a copper film in order to investigate the expansin of plasma into a vacuum. The electron shadowgraphy clearly showed shock wave in the plasma and a dense plume having an expansion speed of 970 and 110km⁄s, respectively, for picosecond laser irradiation. Time-resolved X-ray diffraction was also performed to probe the shock wave in single-crystal silicon under picosecond laser irradiation, and the temporal and spatial evolution of the strain profiles in the silicon crystal was measured.
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