9 November 1993 Imaging using fourth-order correlations of coherent fields
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Abstract
Correlations of coherent backscatter intensities have been used to form Fourier spectra of coherently illuminated objects. Both second and some fourth-order correlations have been studied. We add to this by describing a new method using fourth order field correlations for imaging. If one knows the actual object speckle field, or certain sheared versions of it, then it is possible through fourth-order correlations to obtain the incoherent brightness function of the object. The technique will allow simultaneous averaging-out of both field phase distortions, certain field measurement noises, and laser speckle.
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John D. Gonglewski, David G. Voelz, David Charles Dayton, Timothy J. Schulz, "Imaging using fourth-order correlations of coherent fields", Proc. SPIE 2029, Digital Image Recovery and Synthesis II, (9 November 1993); doi: 10.1117/12.161997; https://doi.org/10.1117/12.161997
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KEYWORDS
Speckle

Critical dimension metrology

Speckle pattern

Image restoration

Information operations

Signal to noise ratio

Backscatter

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