研究目的
To determine the optimal defocused distance for laser cleaning without causing damage to the substrate.
研究成果
The study demonstrated that less damage is realized when the distance is placed within the Rayleigh region. An optimized distance is crucial for contamination removal without damaging the substrate.
研究不足
The study is limited to pure aluminium substrates and a specific range of defocused distances (0-25 mm). The applicability to other materials and wider ranges needs further investigation.
1：Experimental Design and Method Selection:
A Q-switched Nd:YAG laser was used to create breakdown in the air, indicating plasma formation and shock wave generation. Pure aluminium was used as a substrate.
2：Sample Selection and Data Sources:
Pure aluminium (
3：9% purity) was prepared as substrate. List of Experimental Equipment and Materials:
Q-switched Nd:YAG laser, concave and convex lenses, 3D linear translational stage, digital camera, ImageJ software.
4：Experimental Procedures and Operational Workflow:
The defocused distance was varied from 0-25 mm. Damage images were recorded and analyzed.
5：Data Analysis Methods:
ImageJ software was used to analyze the damaged area and depth profile.
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