Abstract: We report Q-switching of a Nd:YAG laser with a phase-conjugation mirror based on external external stimulated Brillouin scattering in CS$-2$/, using a ring resonator. Pulses with 5 mJ minimum energy and duration of 15 ns, at 2 Hz repetition rate, in the TEM$-00$/ mode were generated. A numerical simulation of the Q-switching regime has been made and good agreement between theoretical and experimental data has been obtained. !6
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