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Open Access Publications from the University of California

Terahertz emission from two-plasmon-decay induced transient currents in laser-solid interactions

  • Author(s): Liao, G-Q
  • Li, Y-T
  • Li, C
  • Mondal, S
  • Hafez, HA
  • Fareed, MA
  • Ozaki, T
  • Wang, W-M
  • Sheng, Z-M
  • Zhang, J
  • et al.

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© 2016 AIP Publishing LLC. We have studied the generation of terahertz (THz) radiation via the interaction of intense femtosecond laser pulses with solid targets at a small incidence angle. It is found that preplasma with a moderate density gradient can enhance the emission. We also observe saturation of the THz output with the driving laser energy. We find that THz emission is closely related to the 3/2 harmonics of the driving laser. Particle-in-cell simulations indicate that under the present experimental conditions, the THz emission could be attributed to the transient currents at the plasma-vacuum interface, mainly formed by the two-plasmon-decay instability.

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