Journal
APPLIED OPTICS
Volume 52, Issue 35, Pages 8617-8626Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.52.008617
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Funding
- University College Dublin-China Scholarship Council (UCD-CSC) joint scholarship
- Science Foundation Ireland (SFI)
- Enterprise Ireland under the National Development Plan
- Carl Zeiss-Stiftung [FKZ: 21-0563-2.8/121/1]
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Speckle suppression in a two-diffuser system is examined. An analytical expression for the speckle space-time correlation function is derived, so that the speckle suppression mechanism can be investigated statistically. The grain size of the speckle field illuminating the second diffuser has a major impact on the speckle contrast after temporal averaging. It is shown that, when both the diffusers are rotating, the one with the lower rotating speed determines the period of the speckle correlation function. The coherent length of the averaged speckle intensity is shown to equal the mean speckle size of the individual speckle pattern before averaging. Numerical and experimental results are presented to verify our analysis in the context of speckle reduction. (C) 2013 Optical Society of America
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