Journal
OPTICS COMMUNICATIONS
Volume 282, Issue 9, Pages 1879-1883Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2009.01.051
Keywords
Laser intensity; Beam models; Particle motion; Gauge invariance; Lorentz invariance
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Focussing on null fields as simple models of laser beams we discuss the classical relativistic motion of charges in strong electromagnetic fields. We suggest a universal, Lorentz and gauge invariant measure of laser intensity and explicitly calculate and interpret it for crossed field, plane wave and vortex models. (C) 2009 Elsevier B.V. All rights reserved.
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