| 摘要 | 第6-7页 |
| ABSTRACT | 第7页 |
| 1 INTRODUCTION | 第8-23页 |
| 1.1The unique benefits of femtosecond laser as a machining tool | 第8页 |
| 1.2 Research Background and Significance | 第8-11页 |
| 1.3 Research Inside and Outside of Country and Analysis | 第11-22页 |
| 1.3.1 Research Abroad | 第11-17页 |
| 1.3.2 Research Inside the country | 第17-22页 |
| 1.4 Summary of Research Abroad and inside the Country | 第22页 |
| 1.5 Main Research Contents | 第22-23页 |
| 2 Model setup of simulation of K24 Alloy using single and dual pulses | 第23-35页 |
| 2.1 Modeling steps | 第23-28页 |
| 2.1.1 Evaluation of the main laser parameters variable for a laser sourcepropagated over the focal spot area | 第23-24页 |
| 2.1.2 Electron-system heat equation for single pulse | 第24-25页 |
| 2.1.3 Lattice-system heat equation | 第25-28页 |
| 2.2 Model results | 第28-32页 |
| 2.2.1 Model results for single pulse | 第28-30页 |
| 2.2.2 Model results for dual pulse | 第30-32页 |
| 2.3 Comparison of Electron and Lattice Temperature Distribution in singleand dual pulse and its significance | 第32-34页 |
| 2.4 Summary and conclusion | 第34-35页 |
| 3 Experiments using different techniques of laser drilling | 第35-52页 |
| 3.1 Experimental set up | 第35-36页 |
| 3.2 Sample preparation | 第36页 |
| 3.3 Ablation threshold with femtosecond laser | 第36-38页 |
| 3.4 Experimental Procedure | 第38-51页 |
| 3.4.1 Percussion drilling | 第38-46页 |
| 3.4.2 Trepanning drilling Method | 第46-48页 |
| 3.4.3 Helical drilling method | 第48-51页 |
| 3.5 Conclusion | 第51-52页 |
| 4 Helical drilling Technique of micro-drilling | 第52-58页 |
| 4.1 Preamble | 第52-53页 |
| 4.2 Helical path and overlapping rate of laser pulse in helical drilling | 第53-54页 |
| 4.3 Experimental set up | 第54-55页 |
| 4.4 Results and discussion | 第55-57页 |
| 4.4.1 Evolution of hole shape and temporal analysis | 第55-57页 |
| 4.5 Conclusion | 第57-58页 |
| 结论 | 第58-59页 |
| CONCLUSION | 第59-60页 |
| REFERENCES | 第60-66页 |
| ACKNOWLEDGEMENT | 第66页 |
