Structure of a laser-induced shock wave in water

Abstract eng:
We experimentally investigate the structure of a laser-induced underwater shock wave, which is often modelled as spherically symmetric. We measure plasma formation, shock wave expansion, and pressure in water using a combined measurement system. The pressure measurements reveal that the distribution of peak pressure is non-spherically-symmetric while pressure impulse distributes symmetrically for a wide range of experimental parameters. With considering high-resolution nanosecond-order image sequences of plasma and shock waves, we model the structure of a laser-induced shock wave as a collection of spherical shocks originated from multiple plasmas. The model is found to rationalize both spherically-symmetric distribution of pressure impulse and non-spherically-symmetric distribution of peak pressure.

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