Abstract
Manufacturing-induced defects have drawn more and more attentions to improve the laser damage resistance performance of KDP crystal applied in high-power laser systems. Here, the morphology of surface scratches on diamond fly-cut KDP crystal is characterized and their effect on the laser damage resistance is theoretically and experimentally investigated. The results indicate that surface scratches could lower laser-induced damage threshold (LIDT) by modulating incident lasers and producing resultant local light intensifications. The induced maximum light intensity enhancement factors (LIEFs) are dependent on scratch shapes and dimensions. The diffraction effects originating from scratch edges are responsible for the strongest light intensification. Even for ultra-precision finished KDP surface with scratches that well satisfy the currently applied scratch/dig specification, the induced LIEFs are quite high, indicating that the actual defect dimension allowance should be amended and specified according to the defect-induced LIEFs. The effect of scratches on laser damage resistance is experimentally verified by the tested LIDT, which is approximately consistent with the simulation one. The morphologies of laser damage sites further confirm the role of scratches in lowering LIDT. This work could offer new perspective and guidance for fully evaluating the performance of ultra-precision manufactured optical materials applied in high-power laser facilities.
| Original language | English |
|---|---|
| Article number | 102753 |
| Number of pages | 11 |
| Journal | Results in Physics |
| Volume | 15 |
| Early online date | 16 Oct 2019 |
| DOIs | |
| Publication status | Published - 31 Dec 2019 |
| Externally published | Yes |
Funding
We gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51705105), Young Elite Scientists Sponsorship Program by CAST (No. 2018QNRC001), China Postdoctoral Science Foundation Funded Project (Nos. 2017M621260, 2018T110288), Heilongjiang Postdoctoral Fund (No. LBH-Z17090), Fundamental Research Funds for the Central Universities (No. HIT.NSRIF.2019053), Science Challenge Project (No. TZ2016006-0503-01), Self-Planned Task (Nos. SKLRS201803B, SKLRS201718A) of State Key Laboratory of Robotics and System (HIT) and Opening Project of Key Laboratory of Testing Technology for Manufacturing Process (Southwest University of Science and Technology). We gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 51705105 ), Young Elite Scientists Sponsorship Program by CAST (No. 2018QNRC001 ), China Postdoctoral Science Foundation Funded Project (Nos. 2017 M621260 , 2018 T110288 ), Heilongjiang Postdoctoral Fund (No. LBH-Z17090 ), Fundamental Research Funds for the Central Universities (No. HIT.NSRIF. 2019053 ), Science Challenge Project (No. TZ2016006-0503-01 ), Self-Planned Task (Nos. SKLRS201803B , SKLRS201718A ) of State Key Laboratory of Robotics and System (HIT) and Opening Project of Key Laboratory of Testing Technology for Manufacturing Process ( Southwest University of Science and Technology ).
Keywords
- diamond fly-cutting
- KDP crystal
- laser damage resistance performance
- light intensification
- manufacturing-induced defects