Fig. 1. Schematic energy level diagrams of Nd∶YAG

Fig. 2. Structural schematic of laser device

Fig. 3. spectrum of seed

Fig. 4. The transmission curve of the output coupler M₁

Fig. 5. The transmission curve of the output coupler M₂

Fig. 6. Schematic of ramp-fire signal

Fig. 7. Output energy versus pump current

Fig. 8. Energy stability diagram

Fig. 9. Pulse profile of laser

Fig. 10. Wavelength of output laser

Fig. 11. Structural schematic of beat frequency measurement device

Fig. 12. Beat frequency signal diagram

Fig. 13. Spectrum of heterodyne beat signal

Fig. 14. Frequency stability measurement