Investigating surface damage characteristics in DKDP crystals by laser irradiation at 355 nm and 1064 nm

Shi Jinfang; Qiu Rong; Guo Decheng; Zhou Lei; Jiang Yong; Zhou Qiang; Yu Jian; Chen Yuanpan; Xie Zhun

doi:10.11884/HPLPB202335.220419

Volume 35 Issue 7

Jun. 2023

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Article Navigation > High Power Laser and Particle Beams > 2023 > 35(7): 071003

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Shi Jinfang, Qiu Rong, Guo Decheng, et al. Investigating surface damage characteristics in DKDP crystals by laser irradiation at 355 nm and 1064 nm[J]. High Power Laser and Particle Beams, 2023, 35: 071003. doi: 10.11884/HPLPB202335.220419

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Investigating surface damage characteristics in DKDP crystals by laser irradiation at 355 nm and 1064 nm

doi: 10.11884/HPLPB202335.220419

1.
Key Laboratory of Testing Technology for Manufacturing Process of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
2.
Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China

Received Date: 2022-12-21
Accepted Date: 2023-03-21
Rev Recd Date: 2023-03-24

Available Online: 2023-05-17

Publish Date: 2023-06-15

Abstract

Abstract

The surface damage characteristics in DKDP crystals under laser irradiation at 355 nm and 1064 nm were studied and compared by using a Nd: YAG laser. The damage precursors and mechanisms corresponding to each damage morphologies were analyzed. The damage results reveal that the surface damage in DKDP crystal is more complex than that in bulk damage. Under the irradiation laser corresponding to the pulse width of 10 ns and the damage probability at 0% − 50%, surface damage morphology in DKDP crystals mainly contained four typical damage morphology: crater with cavity, crater with flat bottom, surface damage crack, and surface ablation. Through the comparison and analysis of the imaging of optical microscope and scanning electron microscope, damage precursors that induced damage craters with bottom cavity and surface cracks were mainly bulk defects, which were the same as the precursors forming the internal damage points (pinpoints). The precursors that induced damage craters with flat bottom were relatively complex, which could be the surface contamination, surface cracks, machining defects, and shallow surface bulk defects. For surface ablation, it was mainly caused by surface contamination and surface absorption defects. Surface damage is still one of the important factors limiting the laser damage resistance of KDPD crystals.
- laser-induced surface damage,
- DKDP crystal,
- damage morphology,
- material bulk defect,
- surface processing defect

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References

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