Underwater acoustic wave generation by filamentation of terawatt ultrashort laser pulses
Vytautas Jukna, Amelie Jarnac, Carles Mili\'an, Yohann Brelet,, J\'er\^ome Carbonnel, Yves-Bernard Andr\'e, R\'egine Guillermin, Jean-Pierre, Sessarego, Dominique Fattaccioli, Andr\'e Mysyrowicz, Arnaud Couairon, and, Aur\'elien Houard
TL;DR
This study experimentally and numerically investigates how ultrashort terawatt laser pulses create acoustic waves in water through filamentation, revealing the influence of pulse duration and the role of superfilamentation in acoustic emission.
Contribution
It provides new insights into the mechanisms of underwater acoustic wave generation by ultrashort laser pulses, highlighting the impact of pulse duration and plasma filamentation.
Findings
Input pulse duration significantly affects acoustic wave shape and intensity.
Superfilamentation in water is a key mechanism for strong acoustic emission.
The generated acoustic wave has a broad spectrum with a radially directed pressure profile.
Abstract
Acoustic signals generated by filamentation of ultrashort TW laser pulses in water are characterized experimentally. Measurements reveal a strong influence of input pulse duration on the shape and intensity of the acoustic wave. Numerical simulations of the laser pulse nonlinear propagation and the subsequent water hydrodynamics and acoustic wave generation show that the strong acoustic emission is related to the mechanism of superfilamention in water. The elongated shape of the plasma volume where energy is deposited drives the far-field profile of the acoustic signal, which takes the form of a radially directed pressure wave with a single oscillation and a very broad spectrum.
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