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Title: Pulsed mid-infrared radiation from spectral broadening in laser wakefield simulations

Spectral red-shifting of high power laser pulses propagating through underdense plasma can be a source of ultrashort mid-infrared (MIR) radiation. During propagation, a high power laser pulse drives large amplitude plasma waves, depleting the pulse energy. At the same time, the large amplitude plasma wave provides a dynamic dielectric response that leads to spectral shifting. The loss of laser pulse energy and the approximate conservation of laser pulse action imply that spectral red-shifts accompany the depletion. In this paper, we investigate, through simulation, the parametric dependence of MIR generation on pulse energy, initial pulse duration, and plasma density.
Authors:
; ;  [1]
  1. IREAP, University of Maryland, College Park, Maryland 20740 (United States)
Publication Date:
OSTI Identifier:
22227966
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 20; Journal Issue: 7; Other Information: (c) 2013 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; APPROXIMATIONS; BEAM-PLASMA SYSTEMS; INFRARED RADIATION; LASERS; LINE BROADENING; PLASMA DENSITY; PLASMA DIAGNOSTICS; PLASMA SIMULATION; PLASMA WAVES; RED SHIFT; SPECTRAL SHIFT