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

Vinayakrishnan Rajan, Babu Varghese, Ton van Leeuwen, Wiendelt Steenbergen

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)

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.
Original languageUndefined
Pages (from-to)1755-1760
Number of pages6
JournalOptics communications
Volume281
Issue number6
DOIs
Publication statusPublished - 2008

Keywords

  • IR-76412
  • METIS-247373

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