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Acoustic signals generated by filamentation of TW laser pulses in water are characterized experimentally and numerically revealing a strong influence of the input pulse duration on the shape of the acoustic signal.
The propagation of intense ultrashort laser pulses in water is affected by group velocity dispersion and nonlinear effects such as self-focusing and multiphoton absorption [1]. For a laser beam with an input peak power exceeding a few MW propagating in water, a filamentation phenomenon can occur producing a self contraction of the beam accompanied by the formation of an extended plasma channel [2]...
This paper presents a new inversion method in shallow water (0-400 m) for impulsive low-frequency source (0-200 Hz) using a single static receiver. In this configuration, propagation is described by modal theory. The recorded pressure field can be decomposed into modes whose arrival times (which are frequency dependant) contain information about environment. However, modes share a common frequency...
This paper presents a new signal processing tool: frequency warping, and its application in waveguide characterization. It can be applied in the context of signals recorded in shallow water (0-400 m) for an impulsive low-frequency source (0-200 Hz) and a single static receiver. In this configuration, propagation is described by modal theory: the recorded pressure field can be decomposed into several...
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