Controlling multiple filaments by relativistic optical vortex beams in plasmas

Ju, L. B.; Huang, T. W.; Xiao, Kanglin; Wu, Gang; Yang, Shaochen; Li, R.; Yang, Yuchen; Long, T. Y.; Zhang, H.; Wu, S. Z.; Qiao, B.; Ruan, Shilun; Zhou, C. T.

doi:10.1103/physreve.94.033202

Cited by 19 publications

(12 citation statements)

References 59 publications

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“…They are widely used in applications such as optical microscopy, micromanipulation, quantum information, astronomy, etc [6][7][8][9][10]. Recently, vortex laser pulses with relativistic intensities are also achieved based on the techniques of plasma holograms [11], Raman amplification [12], and the light fan [13], which have stimulated much research interest in intense laser-matter interactions and extended the study of OAM into a relativistic regime [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Zhou

Jiang

et al. 2018

New J. Phys.

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A method of using intense Laguerre-Gaussian (LG) laser pulse is proposed to generate ultrarelativistic (multi-GeV) electron beams with controllable helical structures based on a hybrid electron acceleration regime in underdense plasmas, where both the longitudinal charge-separation electric field and transverse laser electric field play the role of accelerating the electrons. By directly interacting with the LG laser pulse, the topological structure of the accelerated electron beam is manipulated and it is spatially separated into multi-slice helical bunches. These results are clearly demonstrated by our three-dimensional particle-in-cell simulations and explained by a theoretical model based on electron phase-space dynamics. This novel regime offers a new degree of freedom for manipulating ultrashort and ultrarelativistic electrons, and it provides an efficient way for generating high-energy highangular-momentum helical electron beams, which may find applications in wide-ranging areas.

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Section: Introductionmentioning

confidence: 99%

Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Zhou

Jiang

et al. 2018

New J. Phys.

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“…As an extension of such a technique, we demonstrate ultrafast beam pattern modulation by employing chirped OV pulses with space variant phase. While this technique of ultrafast beam pattern modulation is too fast to interact with real particles like micro beads, it has the potential to open the way to the applications such as sophisticated laser processing 4 , 8 , 9 , spatially controlled coherent excitation of quasi-particle (phonon, polariton, magnon) 40 , 41 and spatially tailored plasma excitation 42 . It is useful for collective excitation of charge and spin with dynamic degrees of freedom 43 where high-speed modulation is possible by using charge (spin) liquid crystals instead of common molecular liquid crystals.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast beam pattern modulation by superposition of chirped optical vortex pulses

Honda

Yamane

Iwasa

et al. 2022

Sci Rep

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As an extension of pulse shaping techniques using the space–time coupling of ultrashort pulses or chirped pulses, we demonstrated the ultrafast beam pattern modulation by the superposition of chirped optical vortex pulses with orthogonal spatial modes. The stable and robust modulations with a modulation frequency of sub-THz were carried out by using the precise phase control technique of the constituent pulses in both the spatial and time/frequency domains. The performed modulations were ultrafast ring-shaped optical lattice modulation with 2, 4 and 6 petals, and beam pattern modulations in the radial direction. The simple linear fringe modulation was also demonstrated with chirped spatially Gaussian pulses. While the input pulse energy of the pulses to be modulated was 360 $$\upmu $$ μ J, the output pulse energy of the modulated pulses was 115 $$\upmu $$ μ J with the conversion efficiency of $$\sim $$ ∼ 32%. Demonstrating the superposition of orthogonal spatial modes in several ways, this ultrafast beam pattern modulation technique with high intensity can be applicable to the spatially coherent excitation of quasi-particles or collective excitation of charge and spin with dynamic degrees of freedom. Furthermore, we analyzed the Poynting vector and OAM of the composed chirped OV pulses. Although the ring-shaped optical lattice composed of OV pulse with topological charges of $$\pm \, \ell $$ ± ℓ is rotated in a sub-THz frequency, the net orbital angular momentum (OAM) averaged over one optical period is found to be negligible. Hence, it is necessary to require careful attention to the application of the OAM transfer interaction with matter by employing such rotating ring-shaped optical lattices.

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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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Controlling multiple filaments by relativistic optical vortex beams in plasmas

Cited by 19 publications

References 59 publications

Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Manipulating the topological structure of ultrarelativistic electron beams using Laguerre–Gaussian laser pulse

Ultrafast beam pattern modulation by superposition of chirped optical vortex pulses

Nitrogen fluorescence emission induced by femtosecond vortex beams in air

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