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**Harvard**

Harvey, C., Marklund, M. och Holkundkar, A. (2016) *Focusing effects in laser-electron Thomson scattering*.

** BibTeX **

@article{

Harvey2016,

author={Harvey, Christopher and Marklund, Mattias and Holkundkar, A. R.},

title={Focusing effects in laser-electron Thomson scattering},

journal={Physical Review Special Topics. Accelerators and Beams},

issn={1098-4402},

volume={19},

issue={9},

abstract={We study the effects of laser pulse focusing on the spectral properties of Thomson scattered radiation. Modeling the laser as a paraxial beam we find that, in all but the most extreme cases of focusing, the temporal envelope has a much bigger effect on the spectrum than the focusing itself. For the case of ultrashort pulses, where the paraxial model is no longer valid, we adopt a subcycle vector beam description of the field. It is found that the emission harmonics are blue shifted and broaden out in frequency space as the pulse becomes shorter. Additionally the carrier envelope phase becomes important, resulting in an angular asymmetry in the spectrum. We then use the same model to study the effects of focusing beyond the limit where the paraxial expansion is valid. It is found that fields focussed to subwavelength spot sizes produce spectra that are qualitatively similar to those from subcycle pulses due to the shortening of the pulse with focusing. Finally, we study high-intensity fields and find that, in general, the focusing makes negligible difference to the spectra in the regime of radiation reaction.},

year={2016},

keywords={intense laser; gaussian-beam; paraxial approximation; relativistic; electron; radiation reaction; classical-theory; fields; pulses; rays},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 243663

A1 Harvey, Christopher

A1 Marklund, Mattias

A1 Holkundkar, A. R.

T1 Focusing effects in laser-electron Thomson scattering

YR 2016

JF Physical Review Special Topics. Accelerators and Beams

SN 1098-4402

VO 19

IS 9

AB We study the effects of laser pulse focusing on the spectral properties of Thomson scattered radiation. Modeling the laser as a paraxial beam we find that, in all but the most extreme cases of focusing, the temporal envelope has a much bigger effect on the spectrum than the focusing itself. For the case of ultrashort pulses, where the paraxial model is no longer valid, we adopt a subcycle vector beam description of the field. It is found that the emission harmonics are blue shifted and broaden out in frequency space as the pulse becomes shorter. Additionally the carrier envelope phase becomes important, resulting in an angular asymmetry in the spectrum. We then use the same model to study the effects of focusing beyond the limit where the paraxial expansion is valid. It is found that fields focussed to subwavelength spot sizes produce spectra that are qualitatively similar to those from subcycle pulses due to the shortening of the pulse with focusing. Finally, we study high-intensity fields and find that, in general, the focusing makes negligible difference to the spectra in the regime of radiation reaction.

LA eng

DO 10.1103/PhysRevAccelBeams.19.094701

LK http://publications.lib.chalmers.se/records/fulltext/243663/local_243663.pdf

LK http://dx.doi.org/10.1103/PhysRevAccelBeams.19.094701

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