Realization of an optical vortex from light-emitting diode source by a vortex half-wave retarder and using Talbot effect based detection

Srisuphaphon, Sorakrai; Buathong, Sitti; Deachapunya, Sarayut

doi:10.1016/j.optlastec.2021.107746

Cited by 11 publications

(4 citation statements)

References 34 publications

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“…In recent years, optical vortices have been observed as twisted light, which displays some characteristics pertaining to their discrete orbital angular momentum (OAM) along with a phase singularity [1][2][3][4]. Related phenomena have also been investigated in matter-wave vortices of Bose-Einstein condensates, where the wavefunctions are zero at the center.…”

Section: Introductionmentioning

confidence: 99%

Detection of atomic vortex beam using the near-field diffraction method

Deechuen,

Srisuphaphon,

Buathong

et al. 2023

Phys. Scr.

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We theoretically introduce the method for detecting the atomic vortex (AV) of a helium atomic beam. The AV detection is based on near-field diffraction. The simulations relied on the Feynman path integral. The Gaussian beam and velocity distribution of helium atoms are taken into account. Gravitational field is also included in this study. This research can be useful in the field of matter-wave optics.

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Section: Introductionmentioning

confidence: 99%

Detection of atomic vortex beam using the near-field diffraction method

Deechuen,

Srisuphaphon,

Buathong

et al. 2023

Phys. Scr.

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“…The high electro-optical efficiency, strong radiation power, long lifespan, and low cost of LEDs have made them widely used in various fields, including lighting, display, and optical communication. In the past decades, the coherence of light fields has been studied in the context of LED applications such as optical communication [1,2], digital holographic displays [3], and interferometric measurements [4,5]. Measurements of the spatial coherence of LED light fields indicate that they are not completely incoherent, but instead, contain partially coherent light with spatial coherence lengths varying from a few to several tens of micrometers [6,7].…”

Section: Introductionmentioning

confidence: 99%

Light field analysis for modeling and transmission characteristics of partially coherent light-emitting diodes

Zhang

Liu

et al. 2023

Front. Phys.

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When analyzing the transmission characteristics of LEDs for long-distance lighting and communication applications, the light field is commonly assumed to be fully incoherent. However, in reality, the LED light source emits partially coherent light with a spatial coherence length on the order of microns. This paper is based on the generalized higher-order Lambert model of LEDs and aims to construct a Gaussian-Schell model for the LED beam (LED-GSM) on the near-field source plane, with a half-power angle of no more than 10o. Utilizing the cross-spectral density function transmission theory for partially coherent light, this paper provides the LED-GSM model’s spatial coherence length and beam radius at different distances and designs an experiment for measuring the spatial coherence length of LED beams. Experimental measurements of the spatial coherence length and beam spot size of LED beams at different distances are carried out using a Thorlabs LED528EHP light source. The experimental results match well with the theoretical simulations of the LED-GSM model, thus validating its effectiveness. Then, the proposed LED-GSM model is utilized to investigate the long-distance transmission characteristics of partially coherent narrow-beam LED light. Simulation results indicate that the spatial coherence length of the LED light field can reach tens to hundreds of millimeters over transmission distances of several kilometers. The beam radius is much smaller than that of the beam radius based on the fully incoherent model, and the beam intensity distribution also displays distinct differences.

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“…Xiujian Li et al illustrated that high-order cylindrical vector beams were realized by cascading multiple VHWRs 32 . Furthermore, VHWR was used to generate a vortex beam from a partly incoherent light such as a light-emitting diode (LED) 33 , to help trap metallic particles 34 and to measure full polarization states of light 35 and optical rotation effect 36 .…”

Section: Introductionmentioning

confidence: 99%

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

Deachapunya

Srisuphaphon

Buathong

2022

Sci Rep

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Higher orders of orbital angular momentum states (OAMs) of light have been produced with a double-pass configuration through a zero-order vortex half-wave retarder (VHWR). This double-pass technique can reduce the number of VHWR plates used, thus reducing costs. The OAM states of the vortex beams are identified by the near-field Talbot effect. Polarization dependence of the vortex states can also be demonstrated with this VHWR using Talbot effect. Without using the Talbot patterns, this effect of the polarization on the vortex beam can not be recognized. A theoretical validation has also been provided to complement the experimental results. Our study gives an improved understanding of this approach to use a VHWR plate.

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Realization of an optical vortex from light-emitting diode source by a vortex half-wave retarder and using Talbot effect based detection

Cited by 11 publications

References 34 publications

Detection of atomic vortex beam using the near-field diffraction method

Detection of atomic vortex beam using the near-field diffraction method

Light field analysis for modeling and transmission characteristics of partially coherent light-emitting diodes

Production of orbital angular momentum states of optical vortex beams using a vortex half-wave retarder with double-pass configuration

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