Three-dimensional speckle dynamics in paraxial optical systems

Yura, H. T.; Hanson, Steen Grüner; Hansen, René Skov; Rose, Bjarke

doi:10.1364/josaa.16.001402

Cited by 32 publications

(34 citation statements)

References 6 publications

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“…If ε → 0, we find that any decorrelation will be dependent on the variable γ only, i.e., the decorrelation does not depend on the spatial location in x and y. This is consistent with the analysis presented in [3][4][5][6]13].…”

Section: B Interpretationsupporting

confidence: 90%

“…Later, the 3D space-time crosscorrelation function for free-space geometry under Gaussian beam illumination was presented by Yoshimura and Iwamoto [5]. In 1999, the work in [5] was extended by Yura et al [6] to include other paraxial optical systems and soft Gaussian apertures using the ABCD matrix theory with complex values for the system parameters. Recently, a generalized Yamaguchi correlation factor was derived using the Linear Canonical Transform and the associated ABCD matrix theory for a hard limiting aperture [7,8].…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional static speckle fields Part I Theory and numerical investigation

Kelly

Sheridan

2011

J. Opt. Soc. Am. A

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Section: B Interpretationsupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Three-dimensional static speckle fields Part I Theory and numerical investigation

Kelly

Sheridan

2011

J. Opt. Soc. Am. A

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“…As the object and the object plane move along the z-axis, the 3D speckles will move along, as long as the beam parameters in the object plane remain constant. This is in full agreement with predictions in the literature [15,16] for a static (jv xy 0j) object, where the observation plane is scanned along the z-axis instead. However, as we shall come back to later, the individual 3D speckles are not aligned exactly with these lines.…”

Section: A Speckle Dynamics Due To 3d Movement Of An Objectsupporting

confidence: 91%

“…This is in full agreement with the prediction for dynamic speckles given by [15]. However, this result is not in agreement with [16], where the 1∕2 factor in Eqs. (11) and (16) is replaced with the incorrect factor of 1.…”

Section: A Speckle Dynamics Due To 3d Movement Of An Objectsupporting

confidence: 60%

Spatial filtering velocimetry of objective speckles for measuring out-of-plane motion

2012

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This paper analyzes the dynamics of objective laser speckles as the distance between the object and the observation plane continuously changes. With the purpose of applying optical spatial filtering velocimetry to the speckle dynamics, in order to measure out-of-plane motion in real time, a rotational symmetric spatial filter is designed. The spatial filter converts the speckle dynamics into a photocurrent with a quasi-sinusoidal response to the out-of-plane motion. The spatial filter is here emulated with a CCD camera, and is tested on speckles arising from a real application. The analysis discusses the selectivity of the spatial filter, the nonlinear response between speckle motion and observation distance, and the influence of the distance-dependent speckle size. Experiments with the emulated filters illustrate performance and potential applications of the technology.

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“…Studies have shown that this speckle size is dependent on the propagation distance, z (from the illuminated rough surface), the wavelength of light, , and the size of the illuminating spot [9,10] or scattering aperture [11,12]. These studies use a Fresnel transform (FST) to propagate the light field from the optically rough surface or between two phase-space planes [13]. By using the LCT instead of the FST we derive the corresponding speckle size expressions for general paraxial systems.…”

mentioning

confidence: 99%