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Title: Efficient second- and third-harmonic radiation generation from relativistic laser-plasma interactions

We propose an idea to enhance the efficiency of second- and third-harmonic generation by considering the amplitude-modulation of the fundamental laser pulse. A short-pulse laser of finite spot size is modeled as amplitude modulated in time. Amplitude-modulation of fundamental laser contributes in quiver velocity of the plasma electrons and produces the strong plasma-density perturbations, thereby increase in current density at second- and third-harmonic frequency. In a result, the conversion efficiency of harmonic generation increases significantly. Power conversion efficiency of harmonic generation process is the increasing function of the amplitude-modulation parameter of the fundamental laser beam. Harmonic power generated by an amplitude modulated laser is many folds higher than the power obtained in an ordinary case.
Authors:
;  [1] ;  [2]
  1. Department of Physics and Astrophysics, University of Delhi, Delhi 110 007 (India)
  2. Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 500 712 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22410454
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 6; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; AMPLITUDES; CURRENT DENSITY; DISTURBANCES; EFFICIENCY; ENERGY CONVERSION; HARMONIC GENERATION; INTERACTIONS; LASERS; PHOTON BEAMS; PLASMA DENSITY; PULSES; RELATIVISTIC RANGE