Nonlinear Modelling of Start-Up Phase Pressure Spectra from Optically Smoothed Induced Spatial Incoherence Laser Imprint
NAVAL RESEARCH LAB WASHINGTON DC PLASMA PHYSICS DIV
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The spectrum of early time pressure perturbations, due to optically smoothed induced spatial incoherence ISI laser imprint, is computed for a planar target using a forced, dissipative model. The time-dependent ISI laser deposition is computed using a time-dependent electromagnetic full wave Maxwell code. It is found that the pressure spectrum evolves into a power law in which spectral power is transferred from large to smaller scales through a nonlinear cascade process. The model results are compared with experimental observations.
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