Detection and correction of laterally misaligned optical setup for generation of symmetric perfect vortex beam

Dwivedi, Rajeev; Gangwara, Swati; Saha, Shibu; Jaiswala, V K; Mehrotra, Ranjana; Sharma, Parag

doi:10.1016/j.ijleo.2022.168927

Cited by 5 publications

(6 citation statements)

References 44 publications

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“…Theoretically, the PVB has been derived from the Fourier transform of the Bessel-Gaussian (BG) beam, which is first obtained through the Fresnel diffraction integral by using the axicon function and the Laguerre-Gaussian (LG) beam profile [20]. The intensity profile of the PVB can thus be obtained from the amplitude function given by:…”

Section: Results and Methodsmentioning

confidence: 99%

“…The term I l 2r ′ rr ω 2 is an lthorder modified Bessel function of the first kind. The modified Bessel function is introduced in the term after Fourier transform of the BG beam equation and represents the beam profile in the radial direction [20].…”

Section: Results and Methodsmentioning

confidence: 99%

“…Using the approximation that the annular radius of the PVB is greater than the ring width, equation ( 1) reduces to [20,21]:…”

Section: Results and Methodsmentioning

confidence: 99%

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Generation of a spatially multiplexed perfect vortex beam for digital data transmission

Gangwar

Jaiswal²,

Mehrotra

et al. 2023

J. Opt.

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Perfect vortex beam (PVB) has emerged as a potential candidate for optical communication as its intensity profile remains invariant for different orbital angular momentum (OAM) being carried by the beam. The present study proposes a simple technique for enhancing the data handling capacity of the beam through its spatial multiplexing. The property of variation of ring radius of PVB under Fourier transformation by different focal lengths has been used to generate multiple PVBs of different annular radius, and then combined into a single beam to produce concentric PVB (CPVB). Each ring may represent one bit of digital data. A simple experimental setup was used for generating the beam which has been also validated through theoretical simulation. Further studies confirm that each ring of the CPVB has same phase profile having an impeccable spatial alignment. Spatial multiplexing of the PVB adds an additional degree which can multiply the data handling capacity of the PVB, owing to which it can prove to be a potential candidate for optical data transmission.

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Section: Results and Methodsmentioning

confidence: 99%

Section: Results and Methodsmentioning

confidence: 99%

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Generation of a spatially multiplexed perfect vortex beam for digital data transmission

Gangwar

Jaiswal²,

Mehrotra

et al. 2023

J. Opt.

Self Cite

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“…The appearance of several harmonics in the scattered spectrum can even be a non‐alignment criterion. [ 88,90 ]…”

Section: Discussion and Perspectivesmentioning

confidence: 99%

“…The appearance of several harmonics in the scattered spectrum can even be a nonalignment criterion. [88,90] The rotational Doppler effect, even for a misalignment or an oblique incidence, is well characterized in the case of a uniform rotation, such as the diffusion by a rough surface. There is only one unique rotational velocity and the experimental data can be easily interpreted.…”

Section: Beam Axis and Rotation Axis That Don't Coincidementioning

confidence: 99%

Rotational Doppler Effect: A Review

Emile,

Emile

2023

Annalen der Physik

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Generally, the linear motion between the source of a wave and an observer leads to a linear Doppler effect. It is associated with the linear momentum of the wave. For electromagnetic beams having a circular polarization or an azimuthal phase distribution, the rotation between the source and the observer results in a less well‐known rotational Doppler effect. It is associated with the angular momentum of the wave. This is particularly the case for vortex beams. Here, the various physical insights that are given to explain the origin of the rotational Doppler effect is reviewed. The focus is on different cases where such an effect gives information on the rotational nature of the probed systems, and also on cases where the rotational Doppler effect is useless. Still debated issues and possible applications are then presented.

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