Speckle size and decorrelation time; space–time correlation analysis of coherent light dynamically scattered from turbid media

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Rajan, Vinayakrishnan and Varghese, Babu and Leeuwen van, Ton G. and Steenbergen, Wiendelt (2008) Speckle size and decorrelation time; space–time correlation analysis of coherent light dynamically scattered from turbid media. Optics Communications, 281 (6). pp. 1755-1760. ISSN 0030-4018

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Abstract:We report on the dependence of the decorrelation time on the spatial intensity correlation of speckles generated in the far-field by back-scattered photons from turbid media. The effects contribute to an explanation of an earlier observation that the average Doppler width of the power spectrum of detector current fluctuations depends on the size of the illuminating laser beam. The space–time correlation of the speckles generated by a particle suspension illuminated by a collimated laser beam is analyzed from serial images taken by a high speed camera. It was found that larger spatial correlation distances, associated with large speckles, exhibit a slower temporal decorrelation.

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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/76412
Official URL:http://dx.doi.org/10.1016/j.optcom.2007.11.025
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