研究目的
Investigating the effects of picosecond laser pulses on polycarbonate for welding applications, focusing on the influence of different parameters and irradiation strategies on the material modifications.
研究成果
Local modifications inside polycarbonate were achieved using 10 ps laser pulses, demonstrating potential for welding applications. However, the material's sensitivity to thermal damages limits the process window. Future work should focus on increasing the melt volume and understanding absorption mechanisms through simulative approaches.
研究不足
The study highlights the high sensitivity of polycarbonate to thermal damages when ultrashort pulses are applied, leading to a small process window. The occurrence of thermal damage in the form of soot leads to linear absorption of laser radiation, further increasing thermal damage.
1：Experimental Design and Method Selection:
The study utilized a laser system with 10 ps pulses focused 1 mm below the surface of polycarbonate specimens to investigate nonlinear absorption processes.
2：Sample Selection and Data Sources:
Polycarbonate (Makrolon? GP clear 099) with a thickness of 2 mm was used. After irradiation, microtome cuts were made and analyzed using polarisation microscopy.
3：List of Experimental Equipment and Materials:
HYPER RAPID 100 laser source, IntelliScan 14 scanner, and specific optics were used.
4：Experimental Procedures and Operational Workflow:
The laser beam was focused below the surface, and modifications were investigated under varying pulse energies and feed rates.
5：Data Analysis Methods:
Modifications were analyzed based on their shape and dimensions, with a focus on identifying thermal damages and understanding the absorption mechanisms.
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