The demonstration of optical guiding of high-intensity laser pulses in
a plasma fiber waveguide [C. G. Durfee III and H. M. Milchberg, Phys.
Rev. Lett. 71, 2409 (1993)] has opened the way to new advances in the
development of nonlinear optics-based short-wavelength light sources,
soft x-ray lasers, and compact laser-driven charged particle accelera
tors, and offers a new practical realm in which to study, control, and
apply nonperturbative laser-matter interactions at ultrahigh intensit
y. An overview of selected experimental and theoretical results and th
eir applications is presented. (C) 1996 American Institute of Physics.