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Article

Electron Dynamics and Thomson Scattering for Ultra-Intense Lasers: Elliptically Polarized and OAM Beams

1
Laboratorio Nacional de Fusión, CIEMAT, Avenida Complutense 40, E-28040 Madrid, Spain
2
Departamento de Física Teórica, Facultad de Ciencias Físicas, Universidad Complutense, E-28040 Madrid, Spain
3
Centro de Láseres Pulsados, CLPU, Scientific Park, E-37185 Villamayor, Spain
*
Author to whom correspondence should be addressed.
Current address: Consejo de Seguridad Nuclear, C/Pedro Justo Dorado Dellmans 11, E-28040 Madrid, Spain.
Photonics 2021, 8(6), 182; https://doi.org/10.3390/photonics8060182
Received: 8 April 2021 / Revised: 17 May 2021 / Accepted: 18 May 2021 / Published: 24 May 2021
(This article belongs to the Special Issue Quantum Optics in Strong Laser Fields)
We investigated the classical nonlinear Thomson scattering (TS), from a single relativistic electron, generated by either: (a) an incoming plane wave monochromatic laser radiation and general elliptical polarization or (b) incoming radiations with intrinsic orbital angular momentum (OAM). Both (a) and (b) propagate along the z direction, with wave vector k0, frequency ω0, and initial phase φ00 and have any intensity. Item (a) enables obtaining general electron TS Doppler frequencies and other quantities, for fusion plasmas. We explored the possibility of approximating nonlinear TS with OAM beams (Item (b)) by means of nonlinear TS with plane wave beams (Item (a)). For Item (a), a general explicit solution of the Lorentz relativistic equation and the subsequent TS are given in terms of ζ=ω0tk0z (t denoting time). In particular, it includes the cases for linear and circular polarizations and φ00 for fusion plasmas, thereby extending previous studies for φ0=0. The explicit solutions give rise to very efficient computations of electron TS Doppler frequencies, periods of trajectories, and drift velocities, and the comparisons with ab initio numerical solutions (for Item (a)) yield an excellent match. The approximate approach, using explicit solutions for Item (a), towards TS OAM (employing ab initio numerical computations for Item (b)), extending previously reported ones) yields a quite satisfactory agreement over time spans including several optical cycles, for a wide range of laser intensities, polarizations, and electron energies. The role of φ00 was analyzed. A simple quantitative criterion to predict whether the agreement between the two approaches (a) and (b) would be observed over a given time span is discussed. View Full-Text
Keywords: nonlinear incoherent Thomson scattering; elliptical radiation; linearly and circularly polarized and Doppler frequencies; radiations with orbital angular momentum; influence of initial phase nonlinear incoherent Thomson scattering; elliptical radiation; linearly and circularly polarized and Doppler frequencies; radiations with orbital angular momentum; influence of initial phase
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MDPI and ACS Style

Pastor, I.; Álvarez-Estrada, R.F.; Roso, L.; Guasp, J.; Castejón, F. Electron Dynamics and Thomson Scattering for Ultra-Intense Lasers: Elliptically Polarized and OAM Beams. Photonics 2021, 8, 182. https://doi.org/10.3390/photonics8060182

AMA Style

Pastor I, Álvarez-Estrada RF, Roso L, Guasp J, Castejón F. Electron Dynamics and Thomson Scattering for Ultra-Intense Lasers: Elliptically Polarized and OAM Beams. Photonics. 2021; 8(6):182. https://doi.org/10.3390/photonics8060182

Chicago/Turabian Style

Pastor, Ignacio, Ramón F. Álvarez-Estrada, Luis Roso, José Guasp, and Francisco Castejón. 2021. "Electron Dynamics and Thomson Scattering for Ultra-Intense Lasers: Elliptically Polarized and OAM Beams" Photonics 8, no. 6: 182. https://doi.org/10.3390/photonics8060182

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