Determining the fractional topological charge shifting in perfect vortices from laser speckle

Bianchetti, Arturo; Etchepareborda, Pablo; Federico, Alejandro

doi:10.1016/j.optcom.2019.02.051

Cited by 13 publications

(5 citation statements)

References 35 publications

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“…Yang et al investigated using convolutional neural networks to recognize OAM integer topological modes in the presence of atmospheric disturbances [19]- [21]. In the case of turbid media, OAM images are transformed into speckle patterns [22]- [24]. Huang et al [25] investigated how to classify speckle patterns and identify the integer topological charges using a convolutional neural network (CNN).…”

Section: Introductionmentioning

confidence: 99%

Recognizing Optical Vortex Modes in Ultralow Illuminating Power With Convolutional Neural Network

Zhang,

Qi,

Ouyang

et al. 2023

IEEE Photonics J.

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Vortex beams' orbital angular momentum (OAM) has important application value in optical communication and other fields. Accurate measurement of their OAM topological charges is required for the application of vortex beams in the field of optical communication. As a type of convolutional neural network, DenseNet which combines the "Data Augmentation with Expansion" method, was introduced to measure the fractional topological charge of OAM images in the case of few samples. The OAM images used in this paper generally do not have high brightness, which simulates ultra-long-distance transmission situations in reality. The experiment shows that the classification accuracy of DenseNet network reaches 98.77%, with an average training time of about 1100 seconds, which is short. Our results showcase the potential of convolutional neural network approach to further study the OAM light in the application of free-space optical communication.

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Section: Introductionmentioning

confidence: 99%

Recognizing Optical Vortex Modes in Ultralow Illuminating Power With Convolutional Neural Network

Zhang,

Qi,

Ouyang

et al. 2023

IEEE Photonics J.

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“…The presence of a diffuser in the path of the vortex beam makes speckle patterns have no direct resemblance with vortex beam. Some studies have aimed at retrieving the information of vortex beams from the speckle [27][28][29][30] . These studies are limited to an imaging system [28,29] or require several measurements [27,30] .…”

Section: Introductionmentioning

confidence: 99%

“…Some studies have aimed at retrieving the information of vortex beams from the speckle [27][28][29][30] . These studies are limited to an imaging system [28,29] or require several measurements [27,30] . Analyzing the correlation property in Hanbury Brown-Twiss (HBT) interferometry is a widely used method, and it has also been utilized to examine twisted light, based on the idea of an azimuthal analog of the HBT effect [31] , and measure radial and azimuthal mode indices of the vortex beams [32] .…”

Section: Introductionmentioning

confidence: 99%

Estimating topological charge of propagating vortex from single-shot non-imaged speckle

et al. 2021

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Encoding information using the topological charge of vortex beams has been proposed for optical communications. The conservation of the topological charge on propagation and the detection of the topological charge by a receiver are significant in these applications and have been well established in free-space. However, when vortex beams enter a diffuser, the wavefront is distorted, leading to a challenge in the conservation and detection of the topological charge. Here, we present a technique to measure the value of the topological charge of a vortex beam obscured in the randomly scattered light. The results of the numerical simulations and experiments are presented and are in good agreement. In particular, only a single-shot measurement is required to detect the topological charge of vortex beams, indicating that the method is applicable to a dynamic diffuser.

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“…Light beams carrying orbital angular momentum has a helical structure in its wavefront and phase distribution that depends on exp(−ilϕ), in which ϕ is the azimuthal coordinate of the beam's cross section, and l is the topological charge (or azimuthal index) that can take integer and fractional values [16][17][18].…”

mentioning

confidence: 99%

A Novel Perspective of a Laguerre–Gaussian Beam's Phase Acceleration in Chiral Medium by Using Distinguishability Property

Alban-Chacón,

Pazmiño,

Iza

et al. 2023

IEEE Photonics J.

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Determining the fractional topological charge shifting in perfect vortices from laser speckle

Cited by 13 publications

References 35 publications

Recognizing Optical Vortex Modes in Ultralow Illuminating Power With Convolutional Neural Network

Recognizing Optical Vortex Modes in Ultralow Illuminating Power With Convolutional Neural Network

Estimating topological charge of propagating vortex from single-shot non-imaged speckle

A Novel Perspective of a Laguerre–Gaussian Beam's Phase Acceleration in Chiral Medium by Using Distinguishability Property

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