Self-focusing, compression and collapse of ultrashort weakly-relativistic Laguerre Gaussian lasers in near-critical plasma

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Abstract

Simultaneous self-focusing and compression of ultrashort weakly-relativistic Laguerre-Gaussian laser pulses in dense plasma is investigated theoretically and numerically. A simple theoretical model is developed and used to identify parameter regimes of interest, and then three-dimensional particle-in-cell simulations are carried out to examine the physics in detail. Rapid self-focusing and compression are observed, leading to pulse collapse even for laser pulse energy at the ten millijoule level. Long-lived ring-shaped post-soliton structures are left at the location of the first collapse, and the residual laser energy is scattered into the plasma. Filamentation and re-focusing occur beyond this point, the structure of which depends on the beam parameters but is observed to be only weakly dependent upon the mode of the laser. Circularly-polarised light is found to produce particulary symmetric plasma density structures. In all cases, bursts of MeV electrons with thermal-like spectra are observed at points of collapse.
Original languageEnglish
Article number035002
Number of pages11
JournalJournal of Physics Communications
Volume7
Issue number3
Early online date24 Feb 2023
DOIs
Publication statusPublished - 7 Mar 2023

Keywords

  • Laguerre-Gaussian laser beams
  • particle-in-cell simulations
  • beam parameter

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