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Characteristics of electron beams accelerated by parallel and antiparallel circularly polarized Laguerre–Gaussian laser pulses

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Title
Characteristics of electron beams accelerated by parallel and antiparallel circularly polarized Laguerre–Gaussian laser pulses
Author(s)
Hoon Song; Ki Hong Pae; Junho Won; Jaehyun Song; Seongmin Lee; Chul Min Kim; Chang-Mo Ryu; Woosuk Bang; Chang Hee Nam
Publication Date
2023-04
Journal
Applied Physics B: Lasers and Optics, v.129, no.4
Publisher
Springer Science and Business Media Deutschland GmbH
Abstract
A direct comparison of the properties of electron beam generated by antiparallel circularly polarized Laguerre–Gaussian (CPLG) laser pulse and parallel CPLG laser pulse has been performed with three-dimensional particle-in-cell simulations. It is known that the longitudinal field of an antiparallel CPLG laser pulse with opposite signs of spin and orbital quantum number preferentially accelerates electrons to high energy. However, a direct comparison of electron beam between the other combination of spin and orbital angular momentum, the parallel CPLG laser pulse with the same sign of spin and orbital angular quantum number, has not been conducted. While the two pulses have an identical transverse field envelope, the generated electron beam properties are different. Although the magnitude of the longitudinal field is about one order of magnitude less than that of the transverse field, it has a significant effect on beam divergence. For antiparallel CPLG laser pulse, collimated electron bunches are formed with small divergence (< 50 mrad); while for parallel CPLG laser pulse, a diverging (> 100 mrad) electron beam is formed. This difference in beam quality can indicate a field-induced acceleration in actual experiments. A few-cycle laser pulse and low-density plasma are used to rule out the effect of laser–plasma interaction. It is also shown that for antiparallel CPLG laser pulse, the maximum kinetic energy increases with the square root of incident laser power, consistent with the scaling law for field-induced acceleration. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
URI
https://pr.ibs.re.kr/handle/8788114/13296
DOI
10.1007/s00340-023-07996-y
ISSN
0946-2171
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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