Relativistic Raman instability shifted by half-plasma frequency | Zendy

Gennady Shvets | Zendy; N. J. Fisch | Zendy; Jean-Marcel Rax | Zendy

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Relativistic Raman instability shifted by half-plasma frequency

Author(s) -

Gennady Shvets,

N. J. Fisch,

Jean-Marcel Rax

Publication year - 1996

Publication title -

osti oai (u.s. department of energy office of scientific and technical information)

Language(s) - English

Resource type - Reports

DOI - 10.2172/206588

Subject(s) - instability , raman spectroscopy , raman scattering , plasma , physics , perturbation (astronomy) , nonlinear system , two stream instability , atomic physics , exponential growth , computational physics , optics , quantum mechanics

A new nonlinear Raman instability in underdense plasma is investigated theoretically. Unlike the usual linear Raman instabilities which grow exponentially in time, this instability takes a finite amount of time to diverse. The explosion time t{sub {infinity}} depends on the initial level of the perturbation. A general set of equations for spatio-temporal evolution of the forward non-linear Raman scattering is derived and its temporal evolution is studied in detail. This new instability results in the generation of forward Raman radiation shifted by half the plasma frequency for laser intensities of order or exceeding 10{sup 18}W/cm{sup 2}, something that has been recently observed

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