Title: Shocking a Shock Wave for Nonlinear Summation of GPa Pressures Show Chinese title

Title: 施加一个吉帕压力非线性叠加的冲击波

Abstract: Exploring shock-shock interactions has been limited by experimental constraints, particularly in laser-induced shock experiments due to specialized equipment requirements. Herein, we introduce a tabletop approach to systematically investigate the excitation and superposition of dual laser-induced shock waves in water. Utilizing two laser pulses, spatio-temporally separated and focused into a confined water layer, we identify the optimal superposition leading to the highest combined shock pressure. Our results demonstrate that combining two shock waves each of $\sim$0.6~GPa pressure yields an overall shock pressure of $\sim$3~GPa. Our findings, suggesting an inherent nonlinear summation from the laser excitation process itself and highlights a new pathway for energy-efficient laser shock wave excitation. Show Chinese abstract

Abstract: 探索冲击波之间的相互作用受到实验限制的制约，特别是在激光诱导冲击波实验中，由于需要专门的设备，这种限制尤为明显。 本文介绍了一种桌面方法，用于系统地研究水环境中双激光诱导冲击波的激发与叠加。 通过利用两个时空分离并聚焦于受限水层中的激光脉冲，我们确定了导致最高组合冲击压力的最佳叠加方式。 我们的结果显示，结合两个各自产生$\sim$0.6 GPa 压力的冲击波，可以产生总体 $\sim$3 GPa 的冲击压力。 我们的发现表明，激光激发过程本身存在固有的非线性叠加效应，并揭示了一条高效节能的激光冲击波激发新途径。