The invention relates to a laser amplifier system consisting of a solid
body, which comprises a laser-active medium, of an excitation source for
producing an excited state of the laser-active medium, and of an amplifier
radiation field, which repeatedly permeates the solid body and out of
which a laser beam can be decoupled. The aim of the invention is to
improve a laser-amplifier system of this type so that the highest number
of passages of the amplifier radiation field through the solid body can be
attained using optical means that are provided in the most simple possible
form. To this end, the invention provides radiation field guiding optics
which enable the amplifier radiation field to enter the solid body in the
form of a number of incident branches with locally different trajectories,
and which enable the amplifier radiation field to exit the solid body in
the form of at least one emerging branch with a trajectory that differs
locally from those of the incident branches. In addition, the radiation
field guiding optics comprise at least one deviating unit which, out of at
least one of the branches emerging from the solid body, forms a branch
which enters the solid body and which has a trajectory that differs
locally from that of said emerging branch.
