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    All-optical suppression of relativistic self-focusing of laser beams in plasmas

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    Kalmykov_2008.pdf (234.4Kb)
    Date
    2008-11
    Author
    Kalmykov, S. Yu
    Yi, S. Austin
    Shvets, G.
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    Abstract
    It is demonstrated that a catastrophic relativistic self-focusing (RSF) of a high-power laser pulse can be prevented all-optically by a second, much weaker, copropagating pulse. RSF suppression occurs when the difference frequency of the pulses slightly exceeds the electron plasma frequency. The mutual defocusing is caused by the three-dimensional electron density perturbation driven by the laser beat wave slightly above the plasma resonance. A bienvelope model describing the early stage of the mutual defocusing is derived and analyzed. Later stages, characterized by the presence of a strong electromagnetic cascade, are investigated numerically. Stable propagation of the laser pulse with weakly varying spot size and peak amplitude over several Rayleigh lengths is predicted.
    Department
    Physics
    Subject
    wave accelerator
    raman-scattering
    tenuous plasmas
    pulses
    intense
    modulation
    URI
    http://hdl.handle.net/2152/61111
    xmlui.dri2xhtml.METS-1.0.item-citation
    Kalmykov, S. Yu, S. Austin Yi, and Gennady Shvets. "All-optical suppression of relativistic self-focusing of laser beams in plasmas." Physical Review E 78, no. 5 (2008): 057401.
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