Study on mechanics and key technologies of laser nondestructive mirror-separation for KDP crystal |
| |
| Affiliation: | 1. Faculty of Physics-Engineering Physics, University of Science VNU-HCM, Ho Chi Minh City 72711, Vietnam;2. Vietnam National University, Ho Chi Minh City 71308, Vietnam;1. Laboratory for Precision and Nano Processing Technologies, School of Mechanical and Manufacturing Engineering, The University of New South Wales, NSW 2052, Australia;2. School of Mechatronic Engineering, Harbin Institute of Technology, China;1. State Key Laboratory of Robotics and System, Harbin Institute of Technology, Harbin 150001, China;2. Center for Precision Engineering, Harbin Institute of Technology, Harbin 150001, China;1. National Engineering Research Centre for High Efficiency Grinding, Hunan University, Changsha, Hunan, 410082, China;2. College of Mechanical and Vehicle Engineering, Hunan University, Changsha, Hunan, 410082, China;3. Mechanical, Automotive and Manufacturing (MAM) Faculty of Engineering Environment and Computing, Coventry University, 3 Gulson Road, Coventry, CV1 2JH, UK |
| |
| Abstract: | KDP crystal is an important electro-optic material in various laser systems. At present, the greatest difficulty is the cutting and polishing of large-scale crystals. In this study, a laser nondestructive mirror-separation technology (LNMS) for KDP crystal has been developed for the first time by skillfully adopting femtosecond laser pretreating and fiber laser separating. The separating efficiency of LNMS is at least 200 times faster than that of traditional mechanical cutting, and a nondestructive mirror-separated crystal sidewall with surface roughness (Sa) of 4.7 nm (P−V) and 2.1 nm (RMS), flatness of 5.433 μm and an angular precision about 0.06° could be obtained using the LNMS method. The effects of laser separating parameters, including laser power, laser moving speed and internal stress release on separating accuracy and quality, were investigated and optimized; meanwhile its principle was expounded as well as its mechanism was discussed. The experimental and analyzed results show that the LNMS technology may also have a prospect in the analysis of residual stress distribution inside KDP crystal. A numerical simulation on the thermal stress in the LNMS separating process of KDP crystal was developed to analyze the separating mechanism, which is in good agreement with the theoretical analysis and experimental results. |
| |
| Keywords: | Laser processing Nondestructive mirror-separation KDP crystals Brittle materials Thermal stress simulation |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
