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Title: Sub-structure of laser generated harmonics reveals plasma dynamics of a relativistically oscillating mirror

Theoretical and experimental investigations of the dynamics of a relativistically oscillating plasma slab reveal spectral line splitting in laser driven harmonic spectra, leading to double harmonic series. Both series are well characterized with harmonics arising by two fundamental frequencies. While a relativistic oscillation of the critical density drives the harmonic emission, the splitting is a result of an additional acceleration during the laser pulse duration. In comparison with the oscillatory movement, this acceleration is rather weak and can be described by a plasma shock wave driven by the pressure of light. We introduce particle in cell simulations and an analytical model explaining the harmonic line splitting. The derived analytical formula gives direct access between the splitting in the harmonic spectrum and the acceleration of the plasma surface.
Authors:
; ; ; ;  [1] ;  [1] ;  [2] ;  [3]
  1. Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max Born Str. 2A, 12489 Berlin (Germany)
  2. (Russian Federation)
  3. Vavilov State Optical Institute, Birzhevaya line 4, 199034 St. Petersburg (Russian Federation)
Publication Date:
OSTI Identifier:
22220667
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 8; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ACCELERATION; COMPARATIVE EVALUATIONS; EMISSION; HARMONICS; LASERS; LIGHT TRANSMISSION; MIRRORS; PLASMA DENSITY; PLASMA SIMULATION; PLASMA WAVES; RELATIVISTIC PLASMA; RELATIVISTIC RANGE; SHOCK WAVES; SPECTRA