1 December 1987 Experimental Investigation Of The Longitudinal Characteristics Of Laser Speckle
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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.
C. E. Halford, C. E. Halford, W. L. Gamble, W. L. Gamble, Nicholas George, Nicholas George, } "Experimental Investigation Of The Longitudinal Characteristics Of Laser Speckle," Optical Engineering 26(12), 261263 (1 December 1987). https://doi.org/10.1117/12.7977166 . Submission:
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