The feasibility of using SBS to form diffraction-limited divergence and increase the contrast of radiation in a laser system based on electric-discharge XeCl amplifiers is studied experimentally. It is shown that the phase conjugation at SBS allows correcting for phase distortions in an active medium, as well as astigmatic and spherical aberrations in the optical channel, whereas the SBS itself allows obtaining the radiation contrast up to 106-107 as high.