Self-focusing and energy absorption of a laser beam in an inhomogeneous plasma
Erokhin N. S., Moiseev S. S., Mukhin V. V., Novikov V. E., Sagdeev R. Z.
It is shown that a beam of sufficiently small transverse dimensions can penetrate into the opacity region to a depth that exceeds this dimension. The role of different laser energy absorption mechanisms are discussed. Specifically, a shift in the direction of increase of collisional absorption is shown.