We study high harmonic generation produced by twisted laser pulses, with orbital angular momentum in the relativistic regime, for pulse propagation in underdense plasma. We consider fast time scale processes associated with an ultra-short pulse, where the ion motion can be neglected. We use both analytical models and numerical simulations using a relativistic particle-in-cell code. The present description is valid for relativistic laser intensities, when the normalized field amplitude is much larger than one, a ≫ 1. We also discuss two distinct processes associated with linear and circular polarization. Using both analytical solutions and particle-in-cell simulations, we are able to show that, for laser pulses in a well defined Laguerre-Gauss mode, angular momentum conservation is observed during the process of harmonic generation. Intensity modulation of the harmonic spectrum is also verified, as imposed by the nonlinear time-scale for energy transfer between different harmonics.
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December 2015
Research Article|
December 09 2015
High harmonic generation in underdense plasmas by intense laser pulses with orbital angular momentum
J. T. Mendonça;
J. T. Mendonça
a)
1IPFN, Instituto Superior Técnico,
Universidade de Lisboa
, 1049-001 Lisboa, Portugal
and Instituto de Física, Universidade de São Paulo
, 05508-090 São Paulo, SP, Brazil
Search for other works by this author on:
a)
Electronic mail: josetitomend@gmail.com
b)
Electronic mail: jorge.vieira@ist.utl.pt
Phys. Plasmas 22, 123106 (2015)
Article history
Received:
October 01 2015
Accepted:
November 17 2015
Citation
J. T. Mendonça, J. Vieira; High harmonic generation in underdense plasmas by intense laser pulses with orbital angular momentum. Phys. Plasmas 1 December 2015; 22 (12): 123106. https://doi.org/10.1063/1.4936824
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