Helical filaments array generated by femtosecond vortex beams with lens array in air

Xu, Litong; Li, Dongwei; Chang, Junwei; Xi, Tingting; Hao, Zuoqiang

doi:10.1016/j.rinp.2021.104334

Cited by 17 publications

(12 citation statements)

References 32 publications

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“…In addition to these potential applications above, there are so many other potential applications such as particle acceleration [218][219][220][221], spin-orbit Hall effects [222][223][224][225], optical frequency comb metrology [226][227][228], imaging and holography [229][230][231], waiting for researchers to explore. With recent development of ultrafast optics, the SU(2) wave packets were also studied in structured femtosecond-level ultrashort laser pulse and atomic dynamics in its interaction with matters [232,233].…”

Section: Othersmentioning

confidence: 99%

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

Shen

2021

J. Opt.

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Structured light refers to the ability to tailor optical patterns in all its degrees of freedom, from conventional 2D transverse patterns to exotic forms of 3D, 4D, and even higher-dimensional modes of light, which break fundamental paradigms and open new and exciting applications for both classical and quantum scenarios. The description of diverse degrees of freedom of light can be based on different interpretations, e.g. rays, waves, and quantum states, that are based on different assumptions and approximations. In particular, recent advances highlighted the exploiting of geometric transformation under general symmetry to reveal the ‘hidden’ degrees of freedom of light, allowing access to higher dimensional control of light. In this tutorial, I outline the basics of symmetry and geometry to describe light, starting from the basic mathematics and physics of SU(2) symmetry group, and then to the generation of complex states of light, leading to a deeper understanding of structured light with connections between rays and waves, quantum and classical. The recent explosion of related applications are reviewed, including advances in multi-particle optical tweezing, novel forms of topological photonics, high-capacity classical and quantum communications, and many others, that, finally, outline what the future might hold for this rapidly evolving field.

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Section: Othersmentioning

confidence: 99%

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

Shen

2021

J. Opt.

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“…However, these studies are limited to Gaussian beams. The discovery of orbital angular momentum (OAM) [22] makes the filamentation of femtosecond vortex b eams a hot research topic [23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

“…This special spatial intensity distribution increases the complexity of the filamentation process. As the femtosecond vortex beams propagate in a transparent medium, they have a great chance to split into multiple filaments [27][28][29][30], thus affecting the filamentation dynamics and the accompanied light emission like supercontinuum and fluorescence. In addition, the critical power of self-focusing for Laguerre-Gaussian (LG) beam (a typical kind of vortex beam) is closely related to the TC value l (l1), which can be can be roughly described by P l l P…”

Section: Introductionmentioning

confidence: 99%

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Wang

Zhang

et al. 2023

Phys. Scr.

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Fluorescence emission is a typical nonlinear phenomenon occurring during the femtosecond laser filamentation in air. The characteristics of nitrogen fluorescence emission induced by femtosecond vortex beams in air are experimentally studied. It is found that topological charge has a great influence on the nitrogen fluorescence emission induced by femtosecond filament: the fluorescence signals from nitrogen molecules (e.g., 337, 357 and 380 nm spectral lines) and molecular nitrogen ions (e.g., 391 and 428 nm spectral lines) differ much in the intensity distribution along the propagation direction. The discrepancy is explained by revisiting the generation mechanisms for nitrogen fluorescence, and it is found that the intersystem crossing scheme can account for it, indicating that the intersystem crossing scheme plays the main role in the formation of ${N_2}({C^3}\prod _u^ + )$. This work is helpful to the understanding of the physical mechanism of fluorescence emission induced by the filamentation of femtosecond vortex beams in air.

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“…It can be done using amplitude or phase masks [18][19]. Demonstration of filamentation has been reported with Bessel beams [20], spatially curved airy beams [21][22], or more recently with Laguerre Gaussian beams, also called vortex beams [23][24][25][26][27]. These vortex beams are particularly interesting because they can generate a stable ring profile with a rotating phase.…”

mentioning

confidence: 99%

“…Polynkin et al have demonstrated that femtosecond vortex beams can collapse to form a ring of individual filaments, provided the input pulse power is higher than 1.7mPcr, where Pcr is the critical power for self-focusing and m the topological order of the vortex [24][25]. The term of helical filament has also been used to describe these filaments since this array of filament has been shown to rotate during propagation, due to the phase vorticity of the beam [26][27]. Vortex filaments could find application in the guiding of microwaves or THz waves [14] or act as a guide for optical waves [16].…”

mentioning

confidence: 99%

Femtosecond filamentation of optical vortices for the generation of optical air waveguides

Fu¹,

Mahieu²,

Mysyrowicz³

et al. 2022

Opt. Lett.

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We study the filamentation in air of multi-millijoule optical vortices and compare them with the classical filamentation regime. The femtosecond vortex beam generates multiple plasma filaments organized in a cylindrical geometry. This plasma configuration evolves into a meter-scale tubular neutral gas column that can be used as a waveguide for nanosecond laser pulses at 532 nm. It appears that optical vortices produce a more uniform heating along the propagation axis, when compared with Gaussian or super-Gaussian beams, and that the resulting low-density channel is poorly sensitive to the laser input power thanks to the combination of filamentation intensity clamping and phase vorticity.

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Helical filaments array generated by femtosecond vortex beams with lens array in air

Cited by 17 publications

References 32 publications

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

Rays, waves, SU(2) symmetry and geometry: toolkits for structured light

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

Femtosecond filamentation of optical vortices for the generation of optical air waveguides

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