Abstract
Different ways of varying the output pulse duration in laser schemes comprising a master oscillator, a multipass amplifier and a SBS-mirror are suggested and realized experimentally. Conditions are determined at which introduction of losses between a SBS mirror and an amplifier allow variation of the output pulse duration without any significant decrease in energy. The use of two different SBS media (SnCl 4 and freon) allows construction of a laser where the output pulse duration is varied within 6 - 40 ns and the energy loss is no more than 30%.
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