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Creators/Authors contains: "Wadood, S A"

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  1. ; ; ; ; ; ; ; (, Optics Letters)
    Supergrowth occurs when the local amplitude growth rate of a wave is greater than that predicted by the band limit. While generating supergrowth on demand requires precise source modulation, we demonstrate that supergrowth occurs naturally in a sum of random plane waves. We measure the supergrowing fractional area of transverse, monochromatic, fully developed speckle patterns. For speckle with a disk spectrum, we find that the average fractional supergrowing area approaches 20%. We compare the supergrowing and superoscillating fractional areas and find great similarity in behavior. Our results inform on the ubiquity of superphenomena in speckle patterns and are relevant to imaging and estimation. 
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  2. ; ; ; ; ; (, OSA Continuum)
    We extend conventional coherent Fourier processing techniques to a partially coherent field and modify its spatial coherence using a 4 f system. The coherence is measured by a modified Mach–Zehnder interferometer. Our results corroborate the predictions in [ Opt. Lett. 42 , 4600 ( 2017 ) 10.1364/OL.42.004600 ] and can be extended to a more sophisticated processing of spatial coherence. 
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