Highly efficient terahertz radiation from a thin foil irradiated by a high-contrast laser pulse

Z. Jin, H. B. Zhuo, T. Nakazawa, J. H. Shin, S. Wakamatsu, N. Yugami, T. Hosokai, D. B. Zou, M. Y. Yu, Z. M. Sheng, R. Kodama

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Radially polarized intense terahertz (THz) radiation behind a thin foil irradiated by ultrahigh-contrast ultrashort relativistic laser pulse is recorded by a single-shot THz time-domain spectroscopy system. As the thickness of the target is reduced from 30 to 2 µm, the duration of the THz emission increases from 5 to over 20 ps and the radiation energy increases dramatically, reaching ~10.5 mJ per pulse, corresponding to laser-to-THz radiation energy conversion efficiency of 1.7%. The efficient THz emission can be attributed to reflection (deceleration and acceleration) of the laser driven hot electrons by the target-rear sheath electric field. The experimental results are consistent with that of a simple model as well as particle-in-cell simulation.
Original languageEnglish
Article number03320
JournalPhysical Review E
Publication statusPublished - 26 Sep 2016


  • terahertz radiation
  • laser pulse
  • ultrahigh-contrast
  • ultrashort
  • reflection
  • electric fields
  • transport properties
  • particle beam interactions
  • plasma

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