A STUDY OF LASER ALBATION NEAR THE CRITICAL POINT

摘要

Laser ablation is arguably the most importantrnapplication areas of pulsed lasers, and is also thernfoundation of many other applications, such asrnprecision microfabrication and pulsed laser deposition.rnHowever, underlying physical phenomena are still farrnfrom completely understood because ablation occurs atrnextremely high temperatures and pressures. In thisrnstudy, the author investigates laser material interactionrnwith emphasis on how a material behaves near therncritical point. Employing temperature-dependentrnmaterial property models and the Redlich-Kwongrnequation of state, the critical point behavior ofrnmaterials under laser irradiation is studied at leastrnqualitatively and some interesting results are obtainedrnregarding the change in ablation modes in the thermalrnregime and the role of critical point.