Abstract
This paper presents a numerical study of the dynamics of a mode-locked, Q-switched laser whose cavity contains a travelling-wave acousto-optic modulator (AOM) and a retroreflector which returns the zeroth- and first-order diffracted waves to the AOM. The reflectivity of the retroreflector depends on the order of diffraction. If the AOM is switched on once or periodically, lasing is characterised by a pulse train frequency sweep. Keeping the AOM constantly switched on leads to self-oscillations. Their characteristics can be controlled by varying the detuning of the operating frequency of the modulator from resonance.
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