Phase modulation of an electron flow in the case of large transit angles

Within the framework of a model allowing an analytic solution, the interaction of an electron with the field that is a superposition of a high-frequency (from millimeter- to light-wavelength) electric field and the electrostatic field is considered. The characteristics of the electron motion in the field are investigated as functions of the entrance phase. It is shown that the electron beam flowing through the region of the high-frequency field undergoes modulation that is determined by the phase of the electron entrance into the region of the high-frequency field. It is found that, for certain parameters of the system, the density of an electron flow in free space can effectively be modulated.