Journal
OPTICS EXPRESS
Volume 18, Issue 24, Pages 25035-25051Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.025035
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- National Science Foundation (NSF) [NSF-018899-001]
- Agency for Science, Technology and Research (A*STAR), Singapore
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We study the direct acceleration of a free electron in infinite vacuum along the axis of a pulsed radially-polarized laser beam. We find that net energy transfer from laser pulse to electron is maximized with the tightest focusing. We show that the net energy gain of an electron initially moving at a relativistic velocity may exceed more than half the theoretical limit of energy transfer, which is not possible with an initially stationary electron in the parameter space studied. We determine and analyze the power scaling of maximum energy gain, extending our study to include a relatively unexplored regime of low powers and revealing that substantial acceleration is already possible without the use of petawatt peak-power laser technology. (C) 2010 Optical Society of America
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