The effect of induced spatial incoherence on the absolute Raman instability
- 1 March 1991
- journal article
- research article
- Published by AIP Publishing in Physics of Fluids B: Plasma Physics
- Vol. 3 (3) , 776-780
- https://doi.org/10.1063/1.859873
Abstract
A numerical and analytical study of the Raman instability in a homogeneous plasma is presented in which the pump has been modeled to include the effects of broad bandwidth and the induced spatial incoherence (ISI) method of beam smoothing. For a time‐averaged homogeneous growth rate γ̄0 and a bandwidth σ, there is a significant reduction in Raman backscattering when σ≳2γ0, for γ̄20 near threshold intensity. However, for γ̄20 very large compared to the threshold, neither ISI nor bandwidth affects Raman scattering.Keywords
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