Speckle orientation in paraxial optical systems

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Title: Speckle orientation in paraxial optical systems
Authors: Li, Dayan
Kelly, Damien P.
Kirner, Raoul
Sheridan, John T.
Permanent link: http://hdl.handle.net/10197/3902
Date: Feb-2012
Abstract: The statistical properties of speckles in paraxial optical systems depend on the system parameters. In particular, the speckle orientation and the lateral dependence (x and y) of the longitudinal speckle size can vary significantly. For example, the off-axis longitudinal correlation length remains equal to the on-axis size for speckles in a Fourier transform system, while it decreases dramatically as the observation position moves off axis in a Fresnel system. In this paper, we review the speckle correlation function in general linear canonical transform (LCT) systems, clearly demonstrating that speckle properties can be controlled by introducing different optical components, i.e., lenses and sections of free space. Using a series of numerical simulations, we examine how the correlation function changes for some typical LCT systems. The integrating effect of the camera pixel and the impact this has on the measured first- and second-order statistics of the speckle intensities is also examined theoretically. A series of experimental results are then presented to confirm several of these predictions. First, the effect the pixel size has on the measured first-order speckle statistics is demonstrated, and second, the orientation of speckles in a Fourier transform system is measured, showing that the speckles lie parallel to the optical axis.
Type of material: Journal Article
Publisher: Optical Society of America
Copyright (published version): 2012 Optical Society of America
Keywords: Statistical optics;Diffraction;Speckle imaging;Wave propagation
Subject LCSH: Speckle
Diffraction
Fourier transform optics
DOI: 10.1364/AO.51.0000A1
Language: en
Status of Item: Peer reviewed
Appears in Collections:Electrical and Electronic Engineering Research Collection

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