Abstract

Measurements have been made of the scintillation of a laser beam after propagating over an 8-km path near the ground. The measurements were made with collection apertures ranging from 1 mm to 1 m in diameter. The probability distribution of the scintillation was found to be log-normal for all collector diameters. The log-normal variance decreased smoothly for diameters from 1 mm to about 10 cm, but showed no decrease between 10 cm and 1 m. A hypothesis is offered which explains those results which are anomalous in terms of present theories. Measurements of the log-normal variance were made over extensive periods on three days, during winter, spring, and summer. From these the atmosphere’s refractive-index structure constant, CN2, was computed. Values of CN2 were found to be fairly constant over the full range of measurements, falling between 3 and 6×1015m23, except near sunrise and sunset, when values of about 1×1015m23 were more typical.

© 1967 Optical Society of America

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Corrections

D. L. Fried, G. E. Mevers, and M. P. Keister, "Errata: Measurements of Laser-Beam Scintillation in the Atmosphere," J. Opt. Soc. Am. 58, 1164_2-1164 (1968)
https://www.osapublishing.org/josa/abstract.cfm?uri=josa-58-8-1164_2

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