A novel crystal--multi-compound doped YAG, is used for active-passive modelocking and Q-switching. For a C-axis Nd: YLF laser, the average energy of the pulse train is 5.64mJ, the energy fluctuation is less than +5% with a probabilty of 96.9% and the average pulse width is 1.45ns when Nd: YAG- is used as laser medium, the average energy of the pulse train is 6.79mJ, the fluctuation is less than +4% with a probabilty of 96% and an average pulse width (FWHM), is 270 ps.