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  1. link.aps.org

    We identify and explore a high orbital angular momentum (OAM) harmonics generation and amplification mechanism that manipulates the OAM independently of any other laser property, by preserving the initial laser wavelength, through stimulated Raman backscattering in a plasma. The high OAM harmonics spectra can extend at least up to the limiting value imposed by the paraxial approximation. We ...
    Author:J. Vieira, R. M. G. M. Trines, E. P. Alves, R. A. Fonseca, R. A. Fonseca, J. T. Mendonça, R. Bingham...Published:2016
  2. Here, Gauthieret al. report on the generation of extreme-ultraviolet optical vortices with femtosecond duration carrying a controllable amount of orbital angular momentum.
    Author:D Gauthier, P Rebernik Ribič, G Adhikary, A Camper, C Chappuis, R Cucini, L F DiMauro, G Dovillaire,...Published:2017
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  4. pubs.aip.org

    We study high harmonic generation produced by twisted laser pulses, with orbital angular momentum in the relativistic regime, for pulse propagation in underdense plasma. We consider fast time scale processes associated with an ultra-short pulse, where the ion motion can be neglected.
  5. link.aps.org

    This Letter presents for the first time a scheme to generate intense high-order optical vortices that carry orbital angular momentum in the extreme ultraviolet region based on relativistic harmonics from the surface of a solid target. In the three-dimensional particle-in-cell simulation, the high-order harmonics of the high-order vortex mode is generated in both reflected and transmitted light ...
  6. Aug 2, 2024Coherent interactions between intense light fields and matter give rise to a variety of intriguing phenomena (1, 2), including high-harmonic generation (HHG) and generation of attosecond pulses (3-5), coherent driving of electrons (6, 7), and dynamical modulation of light-dressed electronic structures (8, 9).The overarching framework governing these phenomena is characterized by a ...
  7. researchgate.net

    Donut wakefields generated by intense laser pulses with orbital angular momentum Phys. Plasmas 21, 033107 (2014); 10.1063/1.4868967 Quasi-matched propagation of ultra-short, intense laser pulses ...
  8. absimage.aps.org

    polarised signal beam. The high OAM harmonics result from angular momentum cascading from modes with lower OAM to the modes with higher OAM. The OAM harmonics spectrum can be tailored according to the OAM contents of the pump. We illustrate the scheme with the generation of prime OAM harmonics, an all-optical realisation of the Green-Tao theorem.
  9. pubmed.ncbi.nlm.nih.gov

    The high OAM harmonics s … We identify and explore a high orbital angular momentum (OAM) harmonics generation and amplification mechanism that manipulates the OAM independently of any other laser property, by preserving the initial laser wavelength, through stimulated Raman backscattering in a plasma.
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