Propagation of optical vortices with fractional topological charge in free space

Ali, Tamelia; Kreminska, Liubov; Golovin, Andrii B.; Crouse, David T.

doi:10.1117/12.2062048

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Linear propagation of beams with embedded fractional phase step, i.e. when l is fractional, has been analyzed in [5,17,18,20,26,30]. It was shown that the central part of such beams, in the far field, transforms into an optical vortex of integer charge.…”

Section: Linear Propagation Of Half-charged Vorticesmentioning

confidence: 99%

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Topological charge transformation of beams with embedded fractional phase step in the process of second harmonic generation

Stanislovaitis

Matijošius

Ivanov

et al. 2017

J. Opt.

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We demonstrate collinear second harmonic generation performed with a beam with an embedded initial phase singularity of strength . We examine the law of topological charge conservation during this process. Despite the instability of the initial singularity, we observe a counterintuitive topological charge doubling. In the second harmonic, we observe an optical vortex of strength (topological charge) . The conservation of topological charge is confirmed by both numerical simulations and the experiment. We also provide a qualitative explanation of the process.

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Section: Linear Propagation Of Half-charged Vorticesmentioning

confidence: 99%

“…The wavefront of beams with an initial fractional topological charge has the form of a mixed screw-edge dislocation. These dislocations are unstable and, upon propagation, decay into unit-charged optical vortices in the far field [5,[17][18][19][20], e.g. the strength of the central phase singularity…”

Section: Introductionmentioning

confidence: 99%

Topological charge transformation of beams with embedded fractional phase step in the process of second harmonic generation

Stanislovaitis

Matijošius

Ivanov

et al. 2017

J. Opt.

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Review of vortex beam orbital angular momentum mode detection methods

Lv,

Liu,

Shen

et al. 2024

Materials Today Communications

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Review on fractional vortex beam

et al. 2021

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As an indispensable complement to an integer vortex beam, the fractional vortex beam has unique physical properties such as radially notched intensity distribution, complex phase structure consisting of alternating charge vortex chains, and more sophisticated orbital angular momentum modulation dimension. In recent years, we have noticed that the fractional vortex beam was widely used for complex micro-particle manipulation in optical tweezers, improving communication capacity, controllable edge enhancement of image and quantum entanglement. Moreover, this has stimulated extensive research interest, including the deep digging of the phenomenon and physics based on different advanced beam sources and has led to a new research boom in micro/nano-optical devices. Here, we review the recent advances leading to theoretical models, propagation, generation, measurement, and applications of fractional vortex beams and consider the possible directions and challenges in the future.

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Propagation of optical vortices with fractional topological charge in free space

Cited by 3 publications

References 6 publications

Topological charge transformation of beams with embedded fractional phase step in the process of second harmonic generation

Topological charge transformation of beams with embedded fractional phase step in the process of second harmonic generation

Review of vortex beam orbital angular momentum mode detection methods

Review on fractional vortex beam

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