E. Sandvold, T. Lægreid, et al.
Physica Scripta
New results about the self-focusing of gaussian beams in nonlinear index media are presented. The focusing behavior of initially convergent beams is particularly interesting for powers near the critical power. © 1970.
E. Sandvold, T. Lægreid, et al.
Physica Scripta
R. Vacher, E. Courtens
IUS 1989
E. Courtens
Journal of Physics C: Solid State Physics
E. Courtens, R. Vacher, et al.
EPL