Optical vortex generation by volume holographic elements with embedded phase singularity: Effects of misalignments

Bekshaev, A. Ya.; Sviridova, Svetlana; Popov, A. Yu.; Rimashevsky, A; Tyurin, A. V.

doi:10.3116/16091833/14/4/171/2013

Cited by 6 publications

(4 citation statements)

References 46 publications

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“…However, this is not completely correct. The formed beams are more accurately represented as Kummer beams [44,45,46,47]. They show a specific self-diffraction behaviour upon free propagation, different from that of the LG modes.…”

Section: Structural Features Of Kummer Beamsmentioning

confidence: 99%

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

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In this paper, we demonstrate the capabilities of the terahertz pulse time-domain holography in visualisation, simulation, and assessment of broadband THz vortex beam formation dynamics upon its shaping by elements of beam converter, and further propagation and manipulation. By adding Jones matrix formalism to describe broadband optical elements, we highlight the differences in the spatial-spectral and spatio-temporal structure of the formed vortex and vector beams dependence on the modulator used and visualise their modal features. The influence of diffraction field structure from each element in the broadband vortex modulator is revealed in numerical simulation and the formed beams are analysed against the simplified Laguerre-Gaussian beam model.

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Section: Structural Features Of Kummer Beamsmentioning

confidence: 99%

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Petrov¹,

Sokolenko²,

Kulya³

et al. 2022

gxjzz

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“…Apart from these, volume holograms can also be used to generate OAM modes. [63][64][65][66] Fig . 10 Hologram recording within computer and reconstruction in free space.…”

Section: Generation Using Holographic Optical Elementsmentioning

confidence: 99%

Generation and decomposition of scalar and vector modes carrying orbital angular momentum: a review

et al. 2019

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Orbital angular momentum (OAM), one of the most recently discovered degrees of freedom of light beam field has fundamentally revolutionized optical physics and its technological capabilities. Optical beams with OAM have enabled a large variety of applications, including super-resolution imaging, optical trapping, classical and quantum optical communication, and quantum computing, to mention a few. To enable these and several other emerging applications, optical beams with OAM have been generated using a variety of methods and technologies, such as a simple astigmatic lens pair, one-/two-dimensional holographic optical elements, threedimensional spiral phase plates, optical fibers, and recent entrants such as metasurfaces. All these techniques achieve spatial light modulation and can be implemented with either passive elements or active devices, such as liquid crystal on silicon and digital micromirror devices. Many of these devices and technologies are not only used for the generation of amplitude phase-polarization structured light beams but are also capable of analyzing them. We have attempted to encompass a wide variety of such technologies as well as a few emerging methodologies, broadly categorized into generation and detection protocols. We address the needs of scientists and engineers who desire to generate/detect OAM modes and are looking for the technique (active or passive) best suited for their application. © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…On the other hand, optical vortex beams have always attracted much attention due to their wide applications (Molina-Terriza et al 2001;Yin et al 2003;Gibson et al 2004) and there are many methods to produce optical vortex family experimentally (Strohaber et al 2007, Tokizane et al 2009Bekshaev et al 2012). In this regard, through any biological tissue, the treatment of circular and elliptical of hollow and anomalous hollow Gaussian beams (Saad and Belafhal 2017;Lu et al 2016) and the statistical properties of stochastic vortex beams (Luo et al 2014) have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

Ebrahim

Belafhal

2021

Opt Quant Electron

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In this paper, the effects of turbulent biological tissues (TBT) on the propagation properties of the coherent Laguerre-Gaussian (CLG) beams are studied. Based on the turbulence theory and using the power spectrum refractive-index model, the expression formulae of the average irradiance intensity and spreading properties of a CLG beam propagating in TBT are derived. The influence of propagation distance, beam orders, wavelengths and tissue turbulence parameters are then investigated numerically. It found that, the central dark zone of the circular/elliptical LG beams rises more rapidly as the propagation distance and the structural constant of the refractive index of the biological tissue increase and the beams become eventually more like Gaussian beams in the far-field under the influence of the turbulence biological tissues. Also, the numerical results proved that the effective beam spot radius increases as turbulence, wavelength, and propagation distance are increasing.Ultimately, the beams become circular under the influence of the turbulence of the biological tissue.As found that the effective beam spot radius along the x-axis becomes equal to that of the y-axis in high TBT which explain why an elliptical LG beam is converted into a circular one in higher structural constant of the turbulent tissue. Moreover, our results show that, the influence of the beam order m slightly greater than that of l on the beam spreading.

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Optical vortex generation by volume holographic elements with embedded phase singularity: Effects of misalignments

Cited by 6 publications

References 46 publications

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Design of broadband terahertz vector and vortex beams: II. Holographic assessment

Generation and decomposition of scalar and vector modes carrying orbital angular momentum: a review

Effect of the turbulent biological tissues on the propagation properties of Coherent Laguerre-Gaussian beams

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