Fig. 1. Schematic diagram of laser damage threshold measurement

Fig. 2. Composition of multi-channel synchronous trigger module

Fig. 3. Interface relationship of multi-channel synchronous trigger module

Fig. 4. Delay adjustment accuracy of trigger pulse signal

Fig. 5. SGR-20 laser device and control panel

Fig. 6. Near-field and far-field spot of SGR-20

Fig. 7. Effective pulse width

Fig. 8. Laser pulse waveform at 532 nm

Fig. 9. Laser pulse waveform at 1 064 nm

Fig. 10. Beam spot analyzer

Fig. 11. Pulsed laser spot

Fig. 12. Online microscopy camera

Fig. 13. Damage detection system by online microscopy

Fig. 14. Synchronous trigger timing diagram

Fig. 15. Laser damage threshold test device

Fig. 16. Speckle changes with numbers of laser pulses