An acousto-optically mode-locked Nd:YAG laser, prelasered with an electro-optic Q-switch, energy storage amplified, and modulated with an acousto-optic modulator operated at 50 MHz is described. In the case of embedding a dye-cell into the cavity, the mode-locked laser can be operated either actively or passively. The performance of this laser is as follows: the pulse width varying continuously from 20 ps to several ns, energy of a single pulse greater than 0.1 mJ, and the amplitude stability of the pulse train better than 90%.