论文标题
在液体固体界面上的圆柱波聚焦
Bullseye focusing of cylindrical waves at a liquid-solid interface
论文作者
论文摘要
通过将激光脉冲聚焦在靶心构型中（67 \ mm〜和96 \ mm〜radii）上，通过将激光脉冲聚焦在两个同心环上，从而在玻璃底物上产生了两个收敛和叠加的冲击。我们通过实验研究底物损伤的阈值，这是重复数量和延迟数量的函数（0-20 \，ns）。将靶向焦点的实验与单个聚焦环进行了比较。此外，利用使用流体框架的流体结构相互作用模拟来估计应力。发现雷利波的建设性叠加发现的最低重复数量是延迟$ 10 \，$ ns。观察到的损害与模拟一致，在该模拟中，最大的正应力（$ \ sim 5.6 \，$ gpa）对于以\ dt = 10 \，ns的焦点进行了靶心，其次是\ dt = 20 \，其次是与同时冲击波焦点相对应的\ dt = 20 \，NS。在所有这些情况下，遵循正应力（几纳秒之后），负应力可以达到$ \ sim-6.4 \，$ gpa。
Two converging and superimposing shock and Rayleigh waves are generated on a glass substrate by focusing laser pulses on two concentric rings in a bullseye configuration (67\mm~and 96\mm~radii). We study experimentally the threshold for substrate damage as a function of the number of repetitions and the delay (0-20\,ns). The bullseye focusing experiments are compared to a single focusing ring. Additionally, fluid-structure interaction simulations using a Volume-of-Fluid framework are utilized to estimate the stresses. The lowest number of repetitions to attain surface damage is found for constructive superposition of the Rayleigh waves, i.e., here for a delay of $10\,$ns. The observed damage is consistent with the simulations where the largest positive stresses ($\sim 5.6\,$GPa) are achieved for bullseye focusing with \dt = 10\,ns, followed by \dt= 20\,ns which corresponds to simultaneous shock wave focusing. In all these cases, the positive stresses are followed (a few nanoseconds later) by negative stresses that can reach $\sim-6.4\,$GPa.
