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Root-mean-square difference between the intensities of non-Gaussian speckle at two different wavelengths

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Abstract

The root-mean-square difference between the speckle intensities of two different wavelengths produced in the far field by a rough surface has been studied theoretically and experimentally. The rms differences for various spot sizes, including differences comparable with the correlation length of the surface, are numerically evaluated. The possibility of estimating the correlation length of a rough surface by using speckles of two different wavelengths is discussed and demonstrated experimentally. The experimental results obtained with this optical method are compared with those obtained by a stylus instrument.

© 1981 Optical Society of America

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