Fig. 1. Schematic diagram of the experimental setup.

Fig. 2. Output 486.1 nm laser pulse energy as a function of the pump energy with cavity length of 60 mm.

Fig. 3. Near-field beam profile of OPO output laser with pulse energy of 62 mJ.

Fig. 4. Conversion efficiency and beam divergence angle as a function of the OPO cavity length.

Fig. 5. Pulse temporal profiles of OPO pump laser and output laser.

Fig. 6. OPO output laser spectrum and solar reference spectrum^[20].