Nonlinear Modelling of Start-Up Phase Pressure Spectra from Optically Smoothed Induced Spatial Incoherence Laser Imprint

Abstract

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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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2005
Accession Number
ADA482527

Entities

People

  • Andrew J. Schmitt
  • Michael J. Keskinen

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ablation
  • Celestial Brightness
  • Charged Particles
  • Energy
  • Equations
  • Frequency
  • Intensity
  • Military Research
  • Nanosecond Time
  • Nonlinear Dynamics
  • Particle Physics
  • Perturbations
  • Physics
  • Power Spectra
  • Resonance Absorption
  • Spectra
  • Thermal Conductivity

Fields of Study

  • Physics

Readers

  • Adaptive Control and Estimation with Uncertainty in Dynamic Systems.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Pulsed Power and Plasma Physics.

Technology Areas

  • Directed Energy