Fig. 1. Type I phase matching curve of ZGP

Fig. 2. Experimental setup of tunable LIR laser

Fig. 3. Experimental setup of fundamental light pulse at 50 Hz

Fig. 4. Schematic diagram of pump structure of oscillator

Fig. 5. Output energy versus incident current as the single-pulse energy of oscillator is 23 mJ

Fig. 6. Experimental setup of KTP-OPO

Fig. 7. Single-pulse energy of KTP versus fundamental of 1064 nm

Fig. 8. Characteristics of wavelength of KTP-OPO

Fig. 9. Experimental setup of ZGP-OPO

Fig. 10. Angle-tuning of ZGP-OPO

Fig. 11. Relationship between the single-pulse energy of ZGP-OPO and the pump energy

Fig. 12. Spectrum of signal of ZGP-OPO at different pump wavelengths

Fig. 13. Pump wavelength-tuning