Spatial intensity correlations of a vortex beam and a perfect optical vortex beam

Acevedo, Cristian Hernando; Torres-Moreno, Yezid; Dogariu, Aristide

doi:10.1364/josaa.36.000518

Cited by 16 publications

(3 citation statements)

References 46 publications

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“…This is subsequently converted into a perfect optical vortex beam (POV) in the back focal plane of an appropriate lens where the TPS is located. The emerging speckle pattern is directed towards a Fourier lens such that a non-evolving speckle field is created 59 . The other component is transformed into a spherical wave that passes through a variable liquid crystal retarder (LCR) and acts as a reference for measuring the phase distribution of the scattered optical field in less than 1 ms.…”

Section: Resultsmentioning

confidence: 99%

Phase memory of optical vortex beams

Eshaghi

Acevedo

Batarseh

et al. 2022

Sci Rep

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Optical vortex beams are under considerable scrutiny due to their demonstrated potential for applications ranging from quantum optics to optical communications and from material processing to particle trapping. However, upon interaction with inhomogeneous material systems, their deterministic properties are altered. The way these structured beams are affected by different levels of disturbances is critical for their uses. Here, for the first time, we quantify the degradation of perfect optical vortex beams after their interaction with localized random media. We developed an analytical model that (1) describes how the spatial correlation and the phase variance of disturbance affect the phase distribution across the vortex beams and (2) establishes the regimes of randomness for which the beams maintain the memory of their initial vorticity. Systematic numerical simulations and controlled experiments demonstrate the extent of this memory effect for beams with different vorticity indices.

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Section: Resultsmentioning

confidence: 99%

Phase memory of optical vortex beams

Eshaghi

Acevedo

Batarseh

et al. 2022

Sci Rep

Self Cite

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“…To demonstrate the effect of the speckles' properties on the reconstruction, we used the well-known Gaussian beam and one type of structured light field, namely the perfect optical vortex beam (POV) [15], as the illumination source to modify the speckles. The POV field distributions can generate random fields, namely speckle patterns, with spatial coherence properties that do not evolve on propagation [16][17], while the speckle size can be adjusted at will by the axicon period for the case of the POVs, which can be adjusted by using a spatial light modulator [17]. The average speckle size from a POV can be approximately written as…”

Section: Theoretical Principlesmentioning

confidence: 99%

Active sensing of a hidden object using Gaussian and perfect optical vortices speckles: a comparative study

Lee,

Acevedo,

Dogariu

2024

Three-Dimensional Imaging, Visualization, and Display 2024

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Acquiring information such as the shape, height, and image of a target surrounded by scattering obscurants is a challenging problem involving several random processes. In this work, we approach and compare this problem using theoretical and experimental results from the speckle correlation method. This method involves subjecting the target to illumination by random fields generated by Gaussian and perfect optical vortex (POV) beams to evaluate the orientation of the target. We show that the orientation of the object can be obtained from vortex speckles, whereas the Gaussian speckles provide less information regarding the orientation. Additionally, we demonstrate that the POV speckles have better sensitivity to detect the edges of a target than the Gaussian speckles.

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“…For the case in a Young's interferomenter, for the transverse speckle, it is expected to have a nonlinear size tendency [5]. For further discussion on the generation of speckle through the scattering of optical vortices please see [6,7].…”

Section: Speckle Average Sizementioning

confidence: 99%

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

Muñoz,

Rueda,

Restrepo

2022

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Spatial intensity correlations of a vortex beam and a perfect optical vortex beam

Cited by 16 publications

References 46 publications

Phase memory of optical vortex beams

Phase memory of optical vortex beams

Active sensing of a hidden object using Gaussian and perfect optical vortices speckles: a comparative study

Supplementary document for Experimental generation of adjustable partially coherent optical vortices from coherent and incoherent light sources - 6095583.pdf

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