Bullseye focusing of cylindrical waves at a liquid-solid interface
Abstract
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 ns. The observed damage is consistent with the simulations where the largest positive stresses (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 GPa.
Cite
@article{arxiv.2209.11756,
title = {Bullseye focusing of cylindrical waves at a liquid-solid interface},
author = {Ulisses J. Gutiérrez-Hernández and Hendrik Reese and Claus-Dieter Ohl and Pedro A. Quinto-Su},
journal= {arXiv preprint arXiv:2209.11756},
year = {2022}
}