Effects of Turbulence Instabilities on Laser Propagation (Phase 2)

Abstract

The report on the behavior of laser beams in turbulent air extends results summarized in a previous report, AD-763 109. It is shown that amplitude scintillation is unimportant in focused beams and is dominant in collimated and diverging beams. The limitations of an existing numerical procedure for computing these are investigated. Intermittency of turbulence is redefined in terms of large-scale variations in the refractive-index structure constant and the dependence upon averaging time is determined. It is concluded that intermittency is essentially an extra randomness during operation of the laser for short periods (of several minutes or less). Significant fluctuation rates are defined for angle of arrival, phase, and amplitude. They differ greatly.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1973
Accession Number
AD0766137

Entities

People

  • David A. De Wolf

Organizations

  • Sarnoff Corporation

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Air Force
  • Amplitude
  • Angle Of Arrival
  • Atmospheric Motion
  • Boundary Layer
  • Computational Fluid Dynamics
  • Computational Science
  • Diffraction
  • Electric Fields
  • Intensity
  • Laser Beams
  • Optics
  • Power Spectra
  • Refractive Index
  • Turbulence
  • Wave Propagation
  • Wind Velocity

Fields of Study

  • Physics

Readers

  • Astronomy and Astrophysics.
  • Computational Modeling and Simulation
  • Optical Physics and Photonics.

Technology Areas

  • Directed Energy