دانلود رایگان مقاله انگلیسی تحقیق درباره عکاسی در سرعت بالا در فرآیند فمتوثانیه قطع لیزر - الزویر 2017

Abstract

Using the research of high-speed photography method to carry out the dynamic characteristics of the femtosecond laser ablation process, at the same time, explore a kind of high spatial resolution, response rate and the sensitivity of the new technology means and methods, the thorough analysis and research for dynamics of femtosecond laser ablation of crystal material characteristic has been carried on, we have gotten the characteristics of crystal material.

3. Conclusions

This paper applying the method of high-speed photography, the different femtosecond laser energy under 300 mw, 400mw, 500mw of femtosecond laser ablation of pure aluminum, pure copper, pure iron, monocrystalline silicon micro plasma dynamic process was studied. Experiments can be seen through this part, the high-speed photography method can directly reflect the femtosecond laser ablation of crystal materials produced by micro dynamic process and the basic characteristics of plasma. At the same time, the femtosecond laser ablation crystal materials to produce micro plasma a droplet on the space shape, the size of the micro plasma photography figure on the longitudinal than horizontal direction. With the increase of femtosecond laser energy, the micro plasma on the space also increases as the size. The experimental conclusion can be used to interpret the generating mechanism of laser plasma. These phenomena and theories analysis provide a reference for research in the field of femtosecond laser application value, to further explore the mechanism of the ablation process of femtosecond laser has the important practical significance.