Abstract
The issue of laser-induced damage of transparent dielectric optics has severely limited the development of high-power laser systems. Exploring the transient dynamic behaviors of laser damage on KDP surface by developing multi-physics coupling dynamics model is an important way to reveal the mechanism of nanosecond laser damage. In this work, KDP crystals are taken as an example to explore the mechanism of laser-induced surface damage. Based on the theories of electromagnetic field, heat conduction and fluid dynamics, a multi-physics coupling dynamics model is established for describing the evolution of nanosecond damage processes. The dynamics of laser energy transmission, thermal field distribution and damage morphology during nanosecond laser irradiation are simulated with this model. It is found that the enhancement of light intensity caused by surface defect plays an important role in the initial energy deposition and damage initiation of the laser irradiation area. The evolution of temperature field and crater morphology during subsequent laser irradiation is helpful to understand the laser damage process. The feasibility of this model is verified by the morphology information of typical defect-induced laser damage. This work provides further insights in explaining the laser-induced damage by surface defects on KDP crystals. The model can be also applied to investigate the laser damage mechanisms of other transparent dielectric optics.
| Original language | English |
|---|---|
| Article number | 500 |
| Journal | Scientific Reports |
| Volume | 10 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 1 Dec 2020 |
Funding
We thank Ms. Qing Zhang at Chengdu Fine Optical Engineering Research Center for her careful assistance with the experiments. We also acknowledge the kind help of Mr. Sheng Ouyang at Research Center of Laser Fusion, China Academy of Engineering Physics for valuable discussion in modeling the complex dynamic behavior as well as testing the morphology of the samples. This work was supported by the Science Challenge Project [No. TZ2016006-0503-01]; the National Natural Science Foundation of China [Nos. 51775147, 51705105]; the Young Elite Scientists Sponsorship Program by CAST [No. 2018QNRC001]; the China Postdoctoral Science Foundation [Nos. 2017M621260, 2018T110288]; the Heilongjiang Postdoctoral Fund [No. LBH-Z17090]; the Fundamental Research Funds for the Central Universities [No. HIT.NSRIF.2019053]; and the Self-Planned Task Foundation of State Key Laboratory of Robotics and System (HIT) of China [No. SKLRS201718A, SKLRS201803B].
| Funders | Funder number |
|---|---|
| China Association for Science and Technology for the Young Elite Scientists Sponsorship Program | |
| Heilongjiang Provincial Postdoctoral Science Foundation | LBH-Z17090 |
| National Natural Science Foundation of China | 51705105, 51775147 |
| China Postdoctoral Science Foundation | 2017M621260, 2018T110288 |
| China Academy of Space Technology | 2018QNRC001 |
| Fundamental Research Funds for the Central Universities | |
| Science Challenge Project of China | TZ2016006-0503-01 |
ASJC Scopus subject areas
- General