Near ground measurements of beam shaping and anisotropic turbulence over concrete runway and grass range

Melissa Beason; Frank Sanzone; Joseph Coffaro; Christopher Smith; Jonathon Spychalsky; Bruce Berry; Franklin Titus; Robert Crabbs; Larry Andrews; Ronald Phillips

doi:10.1117/12.2323317

18 September 2018 Near ground measurements of beam shaping and anisotropic turbulence over concrete runway and grass range

Melissa Beason, Frank Sanzone, Joseph Coffaro, Christopher Smith, Jonathon Spychalsky, Bruce Berry, Franklin Titus, Robert Crabbs, Larry Andrews, Ronald Phillips

Author Affiliations +

Proceedings Volume 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII; 107700L (2018) https://doi.org/10.1117/12.2323317
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

Researchers from the University of Central Florida recently carried out a series of measurements over a concrete runway and a grass range using a 632.8 nm Gaussian beam propagated for 100 or 125 m at a height of 2 m. Mean intensity and scintillation index contours varied significantly throughout these measurements in ways that corresponded to more than simple isotropy or anisotropy of optical turbulence. A simple theory is developed to show the effect of a nonlinear index of refraction gradient in addition to the possibility of anisotropic turbulence. Theoretical contours are compared to experimental results which seem to indicate the presence of a beam shaping phenomena near the ground in addition to anisotropy.

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Citation Download Citation

Melissa Beason, Frank Sanzone, Joseph Coffaro, Christopher Smith, Jonathon Spychalsky, Bruce Berry, Franklin Titus, Robert Crabbs, Larry Andrews, and Ronald Phillips "Near ground measurements of beam shaping and anisotropic turbulence over concrete runway and grass range", Proc. SPIE 10770, Laser Communication and Propagation through the Atmosphere and Oceans VII, 107700L (18 September 2018); https://doi.org/10.1117/12.2323317

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