Visible-laser acceleration of relativistic electrons in a semi-infinite vacuum |
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Authors: | Plettner T Byer R L Colby E Cowan B Sears C M S Spencer J E Siemann R H |
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Affiliation: | Stanford University, Stanford, California 94305, USA. |
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Abstract: | We demonstrate a new particle acceleration mechanism using 800 nm laser radiation to accelerate relativistic electrons in a semi-infinite vacuum. The experimental demonstration is the first of its kind and is a proof of principle for the concept of laser-driven particle acceleration in a structure loaded vacuum. We observed up to 30 keV energy modulation over a distance of 1000 lambda, corresponding to a 40 MeV/m peak gradient. The energy modulation was observed to scale linearly with the laser electric field and showed the expected laser-polarization dependence. Furthermore, as expected, laser acceleration occurred only in the presence of a boundary that limited the laser-electron interaction to a finite distance. |
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