Vb. Gildenburg et al., ADIABATIC FREQUENCY UP-CONVERSION OF A POWERFUL ELECTROMAGNETIC PULSEPRODUCING GAS IONIZATION, IEEE transactions on plasma science, 21(1), 1993, pp. 34-44
The theory of strong frequency up-conversion of the powerful ionizing
electromagnetic radiation in gases is presented based on the modified
nonlinear geometrical optics approximation. The permanent spectrum up-
shift versus propagation path, exceeding considerably the initial freq
uency, is demonstrated without strong wave dissipation for the cases o
f impact and field-induced ionization in the high-intense field range.
Reflectionless propagation into the super-critical plasma and broad-b
and tuning of the laser radiation are emphasized as highly promising p
hysical applications of the phenomenon described.