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High-energy electrons produced in subpicosecond laser-plasma interactions from subrelativistic laser intensities to relativistic intensities

Y. T. Li, J. Zhang*, Z. M. Sheng, and J. Zheng

Z. L. Chen, R. Kodama, T. Matsuoka, M. Tampo, K. A. Tanaka, T. Tsutsumi, and T. Yabuuchi

  • Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, People’s Republic of China

  • Institute of Laser Engineering, Osaka University, 2-6 Yamada-Oka, Suita Osaka 565-0871, Japan

  • *Email address: jzhang@aphy.iphy.ac.cn
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Phys. Rev. E 69, 036405 – Published 23 March, 2004

DOI: https://doi.org/10.1103/PhysRevE.69.036405

Abstract

The characteristics of the forward hot electrons produced by subpicosecond laser-plasma interactions are studied for different laser polarizations at laser intensities from subrelativistic to relativistic. The peak of the hot electron beam produced by p-polarized laser beam shifts to the laser propagation direction from the target normal direction as the laser intensity reaches the relativistic. For s-polarized laser pulse, hot electrons are mainly directed to the laser axis direction. The temperature and the maximum energy of hot electrons are much higher than that expected by the empirical scaling law. The energy spectra of the hot electrons evolve to be a single-temperature structure at relativistic laser intensities from the two-temperature structure at subrelativistic intensities. For relativistic laser intensities, the forward hot electrons are less dependent on the laser polarization under the laser conditions. The existing of a preplasma formed by the laser amplified spontaneous emission pedestal plays an important role in the interaction. One-dimensional particle-in-cell simulations reproduce the most characteristics observed in the experiment.

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Phys. Rev. E 69, 036405– Published 23 March, 2004
  • Received 20 October 2003

© 2004 American Physical Society

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