Dependence of speckle contrast on the light spectral broadening and the roughness root mean square

Mansour, Nastaran; Abd-Rabou, Afaf Mahmoud; Elmahdy, Adel Ebrahim; El-Agmy, R. M.; El‐Nicklawy, M. M.

doi:10.1016/j.ijleo.2016.12.066

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Therefore, the referencebeam will be more effective in decreasing the speckle contrast. The case of Є = 0 means that the reference beam is not present, the speckle contrast given by the present derived formula (26) tends to the published formula for the speckle contrast [16,17]. It emphasis the present theoretical view.…”

Section: Discussionsupporting

confidence: 71%

Effect of an Interfering Reference Beam on Partially Developed Speckle Contrast

mansour

Abd-Rabou

2022

Egypt. J. Physics

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T HE present work represents the effect of a coherent reference beam on the contrast of partially developed speckle pattern. An analytical formula for the average speckle contrast in the presence of a coherent reference beam is derived. The theoretical study was showed presence of a reference beam arises mutual interference with the scattered waves contributing in the formationofthe speckle pattern. The produced interference pattern modulates the speckle pattern which decreases its contrast. The speckle contrast can be controlled by the ratio between the intensities of the reference and the scattered beams as well as the optical path difference between the reference and the object beam. Experimental work iscarried out showing the speckle pattern is modulated by interference pattern due to the presence of a reference beam. It leads to decrease the speckle contrast with increasing the intensity of the reference beam with respect to the intensity of the diffused beam from the rough object. The experimental results are in good agreement with the presented theoretical study.

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Section: Discussionsupporting

confidence: 71%

Effect of an Interfering Reference Beam on Partially Developed Speckle Contrast

mansour

Abd-Rabou

2022

Egypt. J. Physics

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“…The random phases of the scattered beams can be represented statistically by two types of phase density probability distributions: either a phase probability of zero or nonzero mean phase value. In a previous work [19], we presented a study on the average speckle contrast considering a phase probability of zero mean phase value. The purpose of this paper is to give a general expression for the average speckle contrast which holds for both types of phase probability distributions.…”

Section: Introductionmentioning

confidence: 99%

New analytical expression for speckle contrast of spectral light broadening

El‐Nicklawy¹,

Abd-Rabou²,

Elmahdy³

2017

J. Opt.

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A new analytical expression for the average speckle contrast is derived for surfaces of random roughness at reflection. Rayleigh and Simpson phase probability density distributions of non-zero phase mean value are assumed for the roughness of the surface. The behavior of a speckle contrast with a roughness root mean square of phase deviation is presented. The effect of the spectral light profile, its spectral width, the density of the scatterers of the rough surface and the average time delay between the interfering beams are taken into consideration.

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A review of surface roughness measurements based on laser speckle method

Shao

et al. 2023

J. Iron Steel Res. Int.

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Dependence of speckle contrast on the light spectral broadening and the roughness root mean square

Cited by 6 publications

References 21 publications

Effect of an Interfering Reference Beam on Partially Developed Speckle Contrast

Effect of an Interfering Reference Beam on Partially Developed Speckle Contrast

New analytical expression for speckle contrast of spectral light broadening

A review of surface roughness measurements based on laser speckle method

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