Fig. 1. Diagram of the 1064 nm laser light path

Fig. 2. Diagram of the 532 nm laser light path

Fig. 3. Change curves of output laser energy with the driving current of the LD pump module and the small signal gain (SSG)

Fig. 4. (a) Energy storage E of gain medium varies with the driving current of LD pump module; (b) G of the gain medium varies with the driving current of the LD pump module at input laser pulse of 3.5 J

Fig. 5. Pulse waveform of the laser output fundamental frequency light (a) and multiple frequency light (b) at the laser exit

Fig. 6. Intensity distribution of laser pulse output (a) fundamental frequency light and (b) double frequency light (two dimensions, three dimensions)