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Deflection of a Reflected Intense Vortex Laser Beam.

Lingang Zhang1,2, Baifei Shen1,3, Xiaomei Zhang1

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.

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Intense vortex laser interaction with plasma reveals a novel deflection effect, deviating from the optical reflection law. This phenomenon, driven by laser-induced shear stress, results in an observable deflection angle out of the plane of incidence.

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Area of Science:

  • Plasma Physics
  • Laser-Matter Interaction
  • Relativistic Optics

Background:

  • The interaction of intense lasers with plasma is a key area in high-energy physics.
  • Vortex lasers possess unique properties, including orbital angular momentum, which can lead to novel interaction mechanisms.
  • Understanding light reflection from plasma is crucial for applications in fusion energy and particle acceleration.

Purpose of the Study:

  • To investigate and reveal a novel deflection effect in the relativistic regime of intense vortex laser-plasma interaction.
  • To elucidate the underlying physical mechanism responsible for the observed deflection.
  • To analyze the role of the vortex beam's topological charge in this interaction.

Main Methods:

  • Full three-dimensional particle-in-cell (PIC) simulations were employed to model the laser-plasma interaction.
  • Analytical modeling using the Maxwell stress tensor was performed to understand the physics.
  • Experimental observation of the deflection angle was considered.

Main Results:

  • A significant deflection effect was observed, deviating from the standard optical reflection law.
  • The reflected beam was deflected out of the plane of incidence with a measurable angle.
  • The deflection was attributed to the breaking of rotational symmetry in the plasma foil due to the vortex beam's unsymmetrical shear stress.

Conclusions:

  • The study demonstrates a new optical phenomenon in relativistic vortex laser-plasma interactions.
  • The topological charge of the vortex beam is identified as a critical factor influencing the shear stress and ponderomotive force.
  • This finding has implications for controlling and understanding light-plasma interactions in high-intensity regimes.