Yi. Salamin, Covariant electron dynamics in two interfering laser beams: analysis of the vacuum beat wave accelerator, PHYS LETT A, 270(3-4), 2000, pp. 115-121
An exact manifestly covariant solution to the equation of motion of a singl
e electron in the fields of two plane waves of arbitrary intensities, frequ
encies, and polarizations is presented and used to derive the main working
equations of the vacuum beat wave accelerator. (C) 2000 Elsevier Science B.
V. All rights reserved.