Linear and Angular Momentum of Classical Particles Interacting with a Laguerre-Gauss Laser Pulse

We investigate the evolution of an ensemble of classical charged particles interacting with a Laguerre-Gauss laser pulse. We integrate 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 unifo...

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Veröffentlicht in:Journal of physics. Conference series 2024-11, Vol.2894 (1), p.012006
Hauptverfasser: Toma, Petru-Vlad, Băran, Virgil, Micluta-Campeanu, Sebastian, Boca, Madalina
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Sprache:eng
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Zusammenfassung:We investigate the evolution of an ensemble of classical charged particles interacting with a Laguerre-Gauss laser pulse. We integrate 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 study the evolution in time of the linear and 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 show that in the low-intensity regime, the net transfer of linear momentum is parallel to the focal plane, while at large intensities the dominant component of the momentum is along the laser propagation direction. We also identify scaling laws obeyed by the net transfer of linear and angular momentum to the particles as a function of the field intensity. We present the relativistic ponderomotive force approximation model and study its validity for different parameters of the laser field. The scaling laws mentioned above are discussed also in the context of this approximation.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/2894/1/012006