Dr. Yang Zhi Profile

Dr. Yang Zhi

at Nanjing Univ. of Science and Technology

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Proceedings Article | 29 December 2023 Paper

Dynamics of nanosecond laser-induced shock waves in water using multiple excitation beams

Yang Zhi, Hengzhu Bao, Lou Gao, Hongchao Zhang, Jian Lu

Proceedings Volume 12976, 129760K (2023) https://doi.org/10.1117/12.3007697

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When a high-power laser beam is incident on water, the rapid heat transfer process triggers ionization of the water in the active region, resulting in an explosion as well as outward propagating shock waves. Here, the formation, propagation, and interaction of underwater shock waves induced by nanosecond laser pulses were experimentally investigated. By fitting the theoretical model (Sedov-Taylor expansion model) to the experimental results, we quantified the effective energy carried by the shock wave during propagation. Numerical simulations with an analytic model using the distance between adjacent breakdown locations as input obtain the shock wave emission images at different time delays and provide insights into experimentally not accessible shock wave parameters. An empirical model is used to describe the pressure behind the shock wave. The results show the near-acoustic propagation behavior of the shock waves at longer time delays. On top of that, we compared the effect of the distance between adjacent excitation positions on the shock wave emission process. The shock wave parameters in the far field are more accurate and easier to perform. Furthermore, utilizing multipoint excitation offers a flexible approach to delve deeper into the physical mechanisms that cause optical tissue damage in nanosecond laser surgery, leading to a better comprehension of the subject.

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