Fig. 1. Damage point morphology in Z-cut KDP crystal irradiated by 1064 nm laser

Fig. 2. Damage morphologies of Z-cut sample induced by 1064 nm laser^[64]

Fig. 3. Transmittance spectrum of KDP and highly-deuterated DKDP crystals^{[64, 66]}

Fig. 4. Laser-induced damage results of 98% deuterium DKDP crystals in R-on-1 method^[64]

Fig. 5. Laser damage resistance enhancement of KDP crystals by continuous filtration techniques^[8]

Fig. 6. Laser damage probability curves for KDP samples grown with no filter (NCF), only 0.1 μm filter (SCF) and two levels of filter (0.1 μm and 0.03 μm) (TCF) in continuous filtration unit^[35]

Fig. 7. Laser induced damage thresholds (LIDTs) and sizes of laser damage precursors in KDP crystals^[35]

Fig. 8. Laser induced damage threshold changes of DKDP crystals by laser conditioning of 355nm laser with different pulse widths (7.6 ns and 500 ps)

Fig. 9. Dark field observation of the generation of damage spots, the change of transmittance at 355 nm and the increase of density of damage spots in Ⅱ-type DKDP crystals during the 355 nm laser conditioning process^[75]

Fig. 10. Z-scan measurement results of samples after different laser conditioning^[37]

Fig. 11. Schematic diagram of valence band electron ionization of DKDP crystal under 355 nm laser

Fig. 12. Time-varying number density of conduction band electrons caused by pure 3PA (solid line) process at 200 J·cm⁻² (7.6 ns, 355 nm) and defect-assisted 3PA (dotted line) process at 15 J·cm⁻² (7.6 ns, 355 nm)^[37]

Fig. 13. Laser conditioning platforms for large size DKDP crystals^[89]

Fig. 14. Statistical results of LIDTs after laser conditioning of 355 nm laser with 7.6 ns and 500 ps

Fig. 15. Four types of temporally shaped sub-ns pulses^[56]

Fig. 16. R-on-1 damage probabilities in 8-ns Gaussian pulse, tested after laser conditioning with different temporally shaped pulses^[56]

Fig. 17. SEM images of typical damage morphology initiated with 8 ns and 23 J·cm⁻² laser. The laser conditioning parameters are marked in the upper right corners of (a)–(e). The two images with an arrow and the insets in (a)–(c) indicate the damage morphologies detected via the optical microscopy^[56]

Fig. 18. Relationship between the deuteration rate of DKDP crystal and the OPA paramaters^[98]

Fig. 19. Transmittance spectrum of the high deuterium DKDP crystals^[64]

Fig. 20. Laser-induced damage results of high deuterium DKDP crystals in R-on-1 method^[64]