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Title: Spectral characteristics of ultra-short laser pulses in plasma amplifiers

Amplification of laser pulses based on the backscattering process in plasmas can be performed using either the response of an electron plasma wave or an ion-acoustic wave. However, if the pulse durations become very short and the natural spread in frequency a substantial amount of the frequency itself, the Raman and Brillouin processes start to mix. Kinetic simulations show the transition from a pure amplification regime, in this case strong-coupling Brillouin, to a regime where a considerable downshift of the frequency of the amplified pulse takes place. It is conjectured that in the case of very short pulses, multi-modes are excited which contribute to the amplification process.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ; ;  [6] ;  [2]
  1. LULI, Université Pierre et Marie Curie—Ecole Polytechnique—CNRS—CEA, 75252 Paris (France)
  2. IZEST, Ecole Polytechnique—CEA, 91128 Palaiseau (France)
  3. (Czech Republic)
  4. SAPIENZA, University of Rome, Dip. SBAI, 00161 Rome (Italy)
  5. (Italy)
  6. LULI, CNRS—Ecole Polytechnique—Université Pierre et Marie Curie—CEA, 91128 Palaiseau (France)
Publication Date:
OSTI Identifier:
22220672
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; AMPLIFICATION; AMPLIFIERS; BACKSCATTERING; ELECTRON PLASMA WAVES; ION ACOUSTIC WAVES; LASERS; PLASMA SIMULATION; PULSES; RAMAN SPECTRA; SOUND WAVES