Accession Number:

ADA030931

Title:

Corkscrew Effect Study

Descriptive Note:

Final rept. 2 Feb 1975-30 Jun 1976

Corporate Author:

LOCKHEED MISSILES AND SPACE CO INC PALO ALTO CA PALO ALTO RESEARCH LAB

Personal Author(s):

Report Date:

1976-08-01

Pagination or Media Count:

63.0

Abstract:

Linearized hydrodynamic equations are solved for the time-dependent density perturbation caused by propagation of a high energy laser beam. The transverse flow of air through the beam due to any combination of wind, laser platform motion and slew angular velocity can have any desired time dependence, both in magnitude and direction. At any distance z along the beam the solution gives the variation in refractive index proportional to the density variation as a function of position in a plane perpendicular to the optical axis. Wave optics calculations are made for the propagation of a beam subject to wind plus non-coplanar slew for the steady-state situation. A scaling law is found for predicting the focal-plane peak irradiance from suitable coplanar calculations.

Subject Categories:

  • Lasers and Masers
  • Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE