Fig. 1. Typical time sequence of the generation of three-step Q-switched pulses.

Fig. 2. Diagram of three-nanosecond-interval sub-pulse laser.

Fig. 3. Waveform of electro-optic Q-switching.

Fig. 4. Performance of conventional Q-switching.

Fig. 5. Three sub-pulse output sequence with different time intervals.

Fig. 6. Pulse width and energy of the three pulses versus pulse interval.

Fig. 7. Relationship of g_th and g_i, g_f at the peak power of 360 kW.