29 December 2000 Thermocapillary mechanism of laser beam self-action in a two-component medium
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Proceedings Volume 4341, Seventh International Symposium on Atmospheric and Ocean Optics; (2000) https://doi.org/10.1117/12.411944
Event: 7th International Symposium on Atmospheric and Ocean Optics, 2000, Tomsk, Russian Federation
Abstract
The thermocapillary mechanism of nonlinearity of two-component medium (aerosol, mocroemulsion) is investigated, in which case the drift of particles in temperature field is due to the temperature dependence of the surface tension coefficient of the phase interface. Redistribution of particles concentration therewith changes the local index of refraction (absorption) of the medium, providing in such a way the presence of nonzero coefficient of efficient cubic nonlinearity. In terms of linear nonequilibrium thermodynamics, the variation of dielectric permeability of two-component medium exposed to action of incident radiation is caused by two fluxes: thermal JT and concentration JC, which in general case are thermodynamically mixed and are determined by kinetic coefficients Lij. In the case of weakly absorbing medium, the expression is obtained for the efficient coefficient of cubic nonlinearity. The experimental investigation of the thermocapillary nonlinearity was conducted in the bubble medium in two regimes: at laser radiation self-action and dynamic hologram recording. The generated hologram was of amplitude-phase character, but due to relatively large size of bubbles, the grid of the extinction coefficient was prevailing.
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V. I. Ivanov, Yu. M. Karpets, "Thermocapillary mechanism of laser beam self-action in a two-component medium", Proc. SPIE 4341, Seventh International Symposium on Atmospheric and Ocean Optics, (29 December 2000); doi: 10.1117/12.411944; https://doi.org/10.1117/12.411944
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