Coherent terahertz emission from a plasma layer due to linear conversion of laser wakefields on pre-modulated ion density

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Abstract

In this paper, electromagnetic emission at the plasma frequency produced by a short laser pulse in a finite-size plasma layer with a longitudinal density modulation is studied using both analytical theory and particle-in-cell simulations. The radiation mechanism suggests that a laser pulse excites a long-lived plasma wake which, in the presence of ion density modulation with the appropriate period, generates a superluminal satellite capable of matching in phase with vacuum electromagnetic waves. It is found that such a mechanism can be used for generating tunable narrow-band (5%) multi-mJ terahertz pulses with high efficiency (>0.3%) due to ability of superluminal plasma oscillations at the cut-off frequency to diffuse through a plasma that is several times wider than the radiation wavelength.

Original languageEnglish
Article number125006
Number of pages7
JournalPlasma Physics and Controlled Fusion
Volume61
Issue number12
DOIs
Publication statusPublished - 28 Oct 2019

Keywords

  • particle-in-cell method
  • plasma wakefields
  • terahertz radiation
  • GENERATION
  • NARROW-BAND
  • PULSES

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