September 2021
Spotlight Summary by Pavan Chandra Konda
Wave-optics simulation of dynamic speckle: I. In a pupil plane
Speckle is an interference phenomenon originating from the scattering of light from rough surfaces, resulting in grainy images. When this was initially discovered, speckle was considered an unwanted artifact corrupting the images; however, this phenomenon was later exploited to create new techniques for various applications in areas ranging from biomedical imaging to surface metrology and LIDAR. To either avoid speckle in some applications or to exploit it in others, the properties of speckle and its propagation needs to be understood well.
The authors in this publication present analytical and numerical models using wave optics to understand dynamic speckle, i.e., changes in the speckle pattern due to perturbations in the imaging system. Such perturbations are commonly introduced to sum the dynamic speckle patterns over the image capture time and produce a speckle free image. Different perturbation methods commonly used to reduce the speckle in images are modeled and their impact on the image quality is presented. The models agree well with previously reported experiments and present an important tool for furthering our understanding of speckle. Such simulations can help optimize the experimental setups to provide high-quality results with good repeatability.
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The authors in this publication present analytical and numerical models using wave optics to understand dynamic speckle, i.e., changes in the speckle pattern due to perturbations in the imaging system. Such perturbations are commonly introduced to sum the dynamic speckle patterns over the image capture time and produce a speckle free image. Different perturbation methods commonly used to reduce the speckle in images are modeled and their impact on the image quality is presented. The models agree well with previously reported experiments and present an important tool for furthering our understanding of speckle. Such simulations can help optimize the experimental setups to provide high-quality results with good repeatability.
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Article Information
Wave-optics simulation of dynamic speckle: I. In a pupil plane
Derek J. Burrell, Mark F. Spencer, Noah R. Van Zandt, and Ronald G. Driggers
Appl. Opt. 60(25) G64-G76 (2021) View: Abstract | HTML | PDF