Features of electro-optical Q-switch: 1.Short switching time (quick switch, about 10-9s) 2.High efficiency 3.Pulse width (10-20nm) 4.High peak power (over dozens of megawatts) The technical indexes to be paid attention to when selecting the electrooptic q-switched crystal: 1.Half wave voltage 2.Damage threshold 3.Modulation mode 4.Extinction ratio 5.Transmittance range 6.Physicochemical properties