Ultrashort lasers have been demonstrated to be powerful tools in manufacturing, material processing, diagnostics, and many other areas. It has great advantages in high power density, small heat-affected-zone, high flexibility, and no material limitation. It is of essential importance to understand the fundamental physics of ultrashort laser–material interaction, which involves complicated multiphysical phenomena. In this talk, I will first present the fundamental research we performed to understand the underlying physical mechanisms of laser induced plasma generation, laser ablation, and laser absorption. A comprehensive numerical model was developed to simulate the laser-matter interaction process, considering all the significant mechanisms. Several techniques were employed to measure the plasma evolution with high temporal and spatial resolution. Next, based on our fundamental studies, I will talk about our work on exploring manufacturing applications of ultrashort lasers, including precise deep hole drilling, waveguide fabrication, micro-fluidic devices fabrication, and solar cell scribing.
Xin Zhao received his B.S. and M.S. degrees in Physics from Tsinghua University in Beijing, China in 2006 and 2008, respectively. He is currently a PhD candidate in Mechanical Engineering at Purdue University. His current research focuses on experimental investigation and numerical modeling of ultrashort laser-matter interaction and laser manufacturing. He intends to enhance the understanding of the fundamental mechanisms during ultrashort laser ablation, especially the role of early plasma, and hence explore its novel applications in different areas. Mr. Zhao has published 13 journal papers and 4 conference papers. He received the College of Engineering Outstanding Graduate Student Research Award at Purdue University in 2014 due to his excellence in research.
Thursday, May 15, 2014
132 Fluor Daniel Building