Faculty of Physics - University of Bucharest

UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS

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2024-11-23 18:11

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Conference: Bucharest University Faculty of Physics 2023 Meeting

Section: Theoretical Physics and Applied Mathematics

Title:

Angular Momentum of Classical Particles Interacting with A Laguerre-Gauss Laser Pulse

Authors:

Petru-Vlad Toma (1,2), Virgil Baran (2), Sebastian Micluța-Câmpeanu (2), Madalina Boca (2)

^*
Affiliation:

1)CETAL, National Institute for Laser, Plasma and Radiation Physics, Atomistilor Street, No. 409, Măgurele, Ilfov, Postal code: RO-077125, Romania

2)Faculty of Physics, University of Bucharest, Atomistilor Street, No. 405, Magurele, Ilfov, Postal code: RO-077125, Romania

E-mail

madalina.boca@gmail.com

Keywords:

Abstract:

We have investigated the evolution of an ensemble of classical charged particles interacting with a Laguerre-Gauss laser pulse. We have integrated numerically the relativistic equations of motion for the particles which at the initial moment (before the arrival of the laser pulse) are at rest, distributed uniformly in a disk in the focal plane of the laser. We have studied the evolution in time of the angular momentum of the particles, and its dependence on the laser parameters (radial and azimuthal indices of the LG mode, waist, duration, and intensity) and also on the initial position of the particle in the focal plane. We have identified scaling laws obeyed by the net transfer of angular momentum to the particles as a function of the field intensity. Finally, we present briefly the relativistic ponderomotive force approximation approach for calculating the final state of the particles, and study the influence of the laser pulse waist and duration on its validity.