W. Yu et al., REALIZATION OF RELATIVISTIC REFLECTORS WITH THE USE OF AN ELECTRON-BEAM AND IONIZATION FRONT, Journal of physics. D, Applied physics, 26(11), 1993, pp. 2093-2095
It is shown that an electron beam and an ionization front can be appli
ed as relativistic moving reflectors; upon reflection from such reflec
tors, the electromagnetic radiation pulse can have significant frequen
cy up-conversion, pulse compression and energy amplification,