It is shown that a single longitudinal mode in a passively Q-switch Nd:YAG laser can be obtained by adjusting an intracavity saturable absorber gelatin film (BDN) to work as a mirror in a three-mirror Fabry–Perot resonator. With a 0.13-mm-thick gelatin film of 40% unsaturated transmission, a temporally smooth single-laser pulse of ∼10 ns duration has been obtained.
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Hariri et al. (1990) studied this question.
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