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Optical Engineering

Experimental Investigation Of The Longitudinal Characteristics Of Laser Speckle
Author(s): C. E. Halford; W. L. Gamble; Nicholas George
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Paper Abstract

The longitudinal dimension of laser speckle was measured in the near field of a uniformly illuminated frosted-glass diffuser. Theory indicates that the speckle produced by the circular spot varies according to XL2/D2, where X is the wavelength of the laser, L is the distance from the observation position to the diffuser, and D is the diameter of the illuminated spot. A single wavelength was used, allowing variation with respect to L and D to be measured. The experimental results obtained closely match the theory. More than 400 speckle lengths were measured, normalized by multiplying by D2/L2, and statistically analyzed to deter-mine a mean of 11µm and a standard deviation of 2.5µm.

Paper Details

Date Published: 1 December 1987
PDF: 2 pages
Opt. Eng. 26(12) 261263 doi: 10.1117/12.7977166
Published in: Optical Engineering Volume 26, Issue 12
Show Author Affiliations
C. E. Halford, Memphis State University (United States)
W. L. Gamble, U.S.Army Missile Command (United States)
Nicholas George, University of Rochester (United States)

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