Enhanced direct laser vacuum acceleration of a charged particle in crossing plane-wave laser beams

Strict theory shows that in the field of two laser beams crossing in vacuum with a phase delay p/2, a unique dynamics of the electron is observed. Unlike a single-beam case in which the velocity component along the laser magnetic field is always zero, the electron motion in the case of crossing beams is completely three-dimensional and hence a larger maximum value of the relativ- istic factor G, i.e. acceleration of an electron to larger energies, can be achieved.