Three-dimensional speckles: static and dynamic properties

Rene Skov Hansen; Harold T. Yura; Steen Gruner Hanson; Bjarke Rose

doi:10.1117/12.370470

18 November 1999 Three-dimensional speckles: static and dynamic properties

Rene Skov Hansen, Harold T. Yura, Steen Gruner Hanson, Bjarke Rose

Proceedings Volume 3904, Fourth International Conference on Correlation Optics; (1999) https://doi.org/10.1117/12.370470
Event: International Conference on Correlation Optics, 1999, Chernivsti, Ukraine

Abstract

A discussion of the static and dynamic 3D behavior of a speckle pattern is given. The discussion is based on general theoretical results, which are valid within the paraxial approximation for a general optical system using the concept of complex ABCD-matrices. Especially, we examine the 3D nature of speckles, which are formed in free-space, in Fourier transform geometry and in imaging systems. The dynamic evolution of these speckles is derived from the space/time-lagged intensity covariance that results from an in-plane translation of a diffuse scattering object, which is illuminated by a Gaussian shaped laser beam in a back- scattering configuration. In particular, the origin of speckle decorrelation will be investigated. Speckles are commonly analyzed in a plane where decorrelation can arise either from true speckle decorrelation or due to a frozen 3D speckle pattern being translated through the plane of observation, i.e. subjective speckle decorrelation. The presentation will be concluded with illustrative experimental results. The implications of the 3D dynamic properties for measurement systems based on speckle correlation will be considered.

Citation Download Citation

Rene Skov Hansen, Harold T. Yura, Steen Gruner Hanson, and Bjarke Rose "Three-dimensional speckles: static and dynamic properties", Proc. SPIE 3904, Fourth International Conference on Correlation Optics, (18 November 1999); https://doi.org/10.1117/12.370470

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