2016
DOI: 10.1103/physreve.93.063106
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Underwater acoustic wave generation by filamentation of terawatt ultrashort laser pulses

Abstract: Acoustic signals generated by filamentation of ultrashort terawatt 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 energ… Show more

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Cited by 30 publications
(13 citation statements)
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“…As pulse energy increased, more energy was converted to white-light continuum and conical emissions, and these conical emissions were also scattered by gold nanoparticles in the dark intervals. We should note that this is different from the phenomenon of "superfilamentation" as reported in references [41] and [42], where the interaction between a large number of laser filaments bring together with weak external focusing, and form a filamentary structure reminiscent of standard filaments, because the pulse energies in our experiments are too low to reach the requirement for "superfilamentation". In addition, laser filamentation induced local water convection and directional motions of long lived bubbles [29] across the plasma channels led to the variation of the local refractive index, which as a consequence, exacerbated stability of the preformed plasma grating in water at high input pulse energies.…”
Section: Resultscontrasting
confidence: 81%
“…As pulse energy increased, more energy was converted to white-light continuum and conical emissions, and these conical emissions were also scattered by gold nanoparticles in the dark intervals. We should note that this is different from the phenomenon of "superfilamentation" as reported in references [41] and [42], where the interaction between a large number of laser filaments bring together with weak external focusing, and form a filamentary structure reminiscent of standard filaments, because the pulse energies in our experiments are too low to reach the requirement for "superfilamentation". In addition, laser filamentation induced local water convection and directional motions of long lived bubbles [29] across the plasma channels led to the variation of the local refractive index, which as a consequence, exacerbated stability of the preformed plasma grating in water at high input pulse energies.…”
Section: Resultscontrasting
confidence: 81%
“…Potemkin et al 36 further investigated different regimes of filamentation and corresponding dynamics of filament-induced shock waves and micro-bubbles in water using different focusing (including aberrations), laser parameters (pulse energy), and medium properties (linear absorption). Jukna et al 37 , 38 revealed the strong influence of pulse duration on the shape and intensity of the acoustic signals generated by filamentation of ultrashort terawatt laser pulses in water, which is related to the mechanism of superfilamention in water. Nevertheless, most studies on laser-assisted bubble dynamics are investigated on single bubbles, predominantly at low laser energies (< 200 µJ).…”
Section: Introductionmentioning
confidence: 99%
“…Future spatiotemporal simulations of plasma growth and plasma energy density distribution will be needed to confirm this hypothesis. [59][60][61][62]…”
Section: Pulse Duration Dependence Of Cutting Energymentioning
confidence: 99%