Long Jiangyou, Eliceiri Matthew, Vangelatos Zacharias, Rho Yoonsoo, Wang Letian, Su Zhengliang, Xie Xiaozhu, Zhang Yongkang, Grigoropoulos Costas P
Opt Express. 2020 May 11;28(10):14300-14309. doi: 10.1364/OE.391584.
In this study, we observe and study the early evolution of cavitation bubbles generated during pulsed laser ablation of titanium targets in different liquid environments utilizing a high-resolution stroboscopic shadowgraphy system. A hydrodynamic model is proposed to calculate the early pressure changes within the bubble and in the surrounding fluid. Our results show that the cavitation bubble is a low-pressure region that is bounded by a high-pressure fluid lamina after the incipient stage, and its evolution is primarily affected by the liquid density. Moreover, the initial bubble pressure increases substantially in high viscosity liquids. This work illuminates how the liquid properties affect the early bubble dynamics and is a step towards a deeper understanding of laser-materials interactions in liquid environments.
在本研究中，我们利用高分辨率频闪阴影成像系统，观察并研究了在不同液体环境中脉冲激光烧蚀钛靶时产生的空化气泡的早期演化过程。提出了一个流体动力学模型来计算气泡内部及其周围流体中的早期压力变化。我们的结果表明，空化气泡是一个低压区域，在初始阶段之后被高压流体层包围，其演化主要受液体密度影响。此外，在高粘度液体中，初始气泡压力会大幅增加。这项工作阐明了液体性质如何影响气泡的早期动力学，是朝着更深入理解液体环境中激光与材料相互作用迈出的一步。
