Abstract
The beam tracing technique allows the description of short-wavelength wave beams by means of a set of ordinary differential equations, in which the effects of diffraction (neglected by the standard geometrical-optics procedure) are taken into account. The propagation of the beam is expressed in terms of a central ray and a set of parameters connected with the curvature of the wave front and the amplitude profile. Two crucial issues for the applicability of this technique to situations of experimental interest are the beam reflection from a mirror and the possibility of following the beam in its vacuum–plasma crossing. These problems are investigated in the paper. The parameters of the incident beam are regarded as known quantities and their values after reflection or inside the plasma are obtained.
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