Персона: Дмитриев, Егор Олегович
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Gain of electron orbital angular momentum in a direct laser acceleration process
Three-dimensional "particle in cell" simulations show that a quasistatic magnetic field can be generated in a plasma irradiated by a linearly polarized Laguerre-Gauss beam with a nonzero orbital angular momentum (OAM). Perturbative analysis of the electron dynamics in the low intensity limit and detailed numerical analysis predict a laser to electrons OAM transfer. Plasma electrons gain angular velocity thanks to the dephasing process induced by the combined action of the ponderomotive force and the laser induced-radial oscillation Similar to the "direct laser acceleration," where Gaussian laser beams transmit part of its axial momentum to electrons, Laguerre-Gaussian beams transfer a part of their orbital angular momentum to electrons through the dephasing process.
Numerical study of momentum and energy transfer in the interaction of a laser pulse carrying orbital angular momentum with electrons
© 2020 Elsevier B.V.Electromagnetic waves, in addition to the energy and momentum, can also carry an orbital angular momentum (OAM). Transfer of these quantities from laser to particles may find various applications. There are similarities between the process of OAM transfer from laser to electrons and a direct electron acceleration in a relativistic electromagnetic wave packet. In this paper, by using a numerical integration of electron's equation of motion, we present a general analysis of the energy and momentum transfer from a laser wave packet carrying orbital angular momentum to electrons. The theoretical model demonstrates that relation between the transfer of the axial and orbital angular momenta from laser to electrons depends strongly on the laser waveform and polarization.