JOURNAL DE PHYSIQUE IV Colloque C4, supplement au Journal de Physique 111, Volume 4, avril1994 Pressure waves induced in liquid under high laser irradiation


It exists many mechanisms leading to soundwaves generation in liquid under a pulsed laser beam irradiation. The type of interaction, the soundwave amplitude and geometry depends on laser intensity, transparency of the medium to the incident radiation and geometry of the irradiated zone. Interaction occurs at the surface or inside the liquid, depending on its low or high absorption coefficient. For low laser intensity, the energy absorption occurs without phase change. In this case, the mechanism inducing the highest pressure is thermoelasticity. It results from the thermic dilatation of a volume of liquid rapidly heated. In this case the pressure amplitude change linearly with energy. Beyond a certain threshold, the breakdown occurs, associated or not with a previous vaporization phase. Linear variation does not exist any more between energy and amplitude of pressure wave. This paper is concerned with an experimental study of the shock wave generated during the breakdown of a transparent liquid. This dielectric breakdown is characterized by an ionisation of the medium leading to the formation of a luminous plasma, which absorbs the inciden

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