Computer Science
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1221..208g&link_type=abstract
IN: Propagation of high-energy laser beams through the earth's atmosphere; Proceedings of the Meeting, Los Angeles, CA, Jan. 15-
Computer Science
Laser Beams, Laser Plasma Interactions, Light Transmission, Phase Deviation, Plasma Turbulence, Spatial Dependencies, Atmospheric Turbulence, Covariance, Degradation, Fast Fourier Transformations, Kolmogoroff Theory
Scientific paper
Evidence is presented which suggests the existence of turbulent atmospheric beam-propagation environments that are not adequately described by a smooth Kolmogorov cascade. Attention is given to a model which alters the Kolmogorov spectrum for refractive index with a 'bump' at high spatial frequencies, as well as to a method for computing the model's phase spectrum in the case of one transverse dimension. Analytical results indicate that, if the total power in the index spectrum is held constant, the total power in the phase spectrum is reduced by the bump's presence; the power is linearly proportional to the fraction of power not contained in the bump. Reduced scintillation is noted in the beam intensity, together with reduced beam centroids.
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