Femtosecond-laser induced ablation of silicate glasses and the intrinsic dissociation energy

The relation between ablation threshold fluence upon femtosecond laser pulse irradiation and the average dissociation energy density of silicate based multicomponent glass is studied. A simple model based on multiphoton absorption quantifies the absorbed energy density at the ablation threshold fluence. This energy density is compared to a calculated energy density which is necessary to decompose the glass compound into its atomic constituents. The results confirm that this energy density is a crucial intrinsic material parameter for the description of the femtosecond laser ablation threshold fluence of dielectrics. (C)2014 Optical Society of America

研究了飞秒激光脉冲辐照下的消融阈值通量与硅酸盐基多组分玻璃的平均离解能密度之间的关系。一个基于多光子吸收的简单模型量化了消融阈值通量下的吸收能密度。将该能密度与将玻璃化合物分解为其原子成分所需的计算能密度进行了比较。结果证实，该能密度是描述电介质飞秒激光消融阈值通量的一个关键的本征材料参数。（C）2014美国光学学会