期刊
MATERIALS & DESIGN
卷 157, 期 -, 页码 447-456出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.matdes.2018.07.057
关键词
Potassium dihydrogen phosphate crystal; Surface damage repairing; Micro-milling; Periodic tool marks; Laser damage resistance; Light intensity distribution
资金
- National Natural Science Foundation of China [51705105, 51775147]
- Science Challenge Project [JCKY2016212A506-0503]
- China Postdoctoral Science Foundation [2017M621260]
- Self-Planned Task of State Key Laboratory of Robotics and System (HIT) [SKLRS201718A]
Micro-milling is the prevailing method to repair laser-induced surface damage on potassium dihydrogen phosphate crystal components applied in high-power laser systems. Scallop tool marks are inevitably generated on repaired surfaces due to the interaction of neighboring tool paths involved in the micro-milling process. In this work, the effect of scallop toolmarks on the optical performance of micro-milled crystal surfaces is theoretically and experimentally investigated. The results indicate that surface toolmarks could be categorized into four bands having different period lengths (L) according to the levels of induced light intensification: high-frequency (0.1 mu m <= L <= 0.7 mu m), high-risk (0.7 mu m <= L <= 1.2 mu m), intermediate-frequency (1.2 mu m <= L <= 100 mu m), and low-frequency (100 mu m <= L <= 1000 mu m) bands. Tool marks in high-risk band play dominant role in degrading the repairing effectiveness that they should be strictly excluded. While for intermediate-frequency band marks, the induced light intensification is low, and the laser damage resistance and transmittance capacity are comparable to those of tool mark-free surface. The experimental results agree well with simulation results, which suggest that machining parameters corresponding to tool marks in intermediate-frequency band should be preferred in the actual micro-milling repairing process. (C) 2018 Elsevier Ltd. All rights reserved.
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