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Déformations, manipulations et instabilités d'interfaces liquides induites par la pression de radiation d'une onde laser

Abstract : We experimentally study the influence of the radiation pressure of a cw laser wave on a liquid interface. The use of near-critical phase-separated liquid mixtures allows us to observe directly micrometric stationary deformations. At the linear stage, i.e for moderate beam intensities, an universal scaling law for the height of the deformations is validated for both propagation directions of the laser beam with regard to the interface. For higher laser excitation a symmetry breaking of the interface deformations versus the direction of propagation is shown. Indeed we observe either the formation of finger (tethers) with large aspect ratio, or the break-up of the interface after an optohydrodynamical instability when the beam propagates from the highest refractive-index medium to the lowest, or inversely. Thereafter we take advantage of those facts to create and stabilize under laser field liquid bridges with aspect ratio far above the classical limit of the Rayleigh-Plateau instability. Thermocapillary deformations linked with the weak temperature rise induced by the laser beam are also analyzed in order to clearly distinguish them from the surface deformations driven by the radiation pressure.
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https://tel.archives-ouvertes.fr/tel-00001637
Contributor : Alexis Casner <>
Submitted on : Thursday, September 5, 2002 - 9:53:20 AM
Last modification on : Monday, January 22, 2018 - 11:02:01 AM
Long-term archiving on: : Tuesday, September 11, 2012 - 5:50:37 PM

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  • HAL Id : tel-00001637, version 1

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Alexis Casner. Déformations, manipulations et instabilités d'interfaces liquides induites par la pression de radiation d'une onde laser. Dynamique des Fluides [physics.flu-dyn]. Université Sciences et Technologies - Bordeaux I, 2002. Français. ⟨tel-00001637⟩

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