Generation of high-field narrowband terahertz radiation by counterpropagating plasma wakefields

  title={Generation of high-field narrowband terahertz radiation by counterpropagating plasma wakefields},
  author={I. V. Timofeev and V. V. Annenkov and Evgeniia Volchok},
  journal={Physics of Plasmas},
It is found that nonlinear interaction of plasma wakefields driven by counterpropagating laser or particle beams can efficiently generate high-power electromagnetic radiation at the second harmonic of the plasma frequency. Using a simple analytical theory and particle-in-cell simulations, we show that this phenomenon can be attractive for producing high-field ( ∼10 MV/cm) tunable terahertz radiation with a narrow line width. For laser drivers produced by existing petawatt-class systems, this… 

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