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Induced transient gratings as a probe of the early-stage kinetics of phase-separating liquid mixtures

机译:感应瞬态光栅作为相分离液体混合物早期动力学的探针

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Because of the large number of nucleated domains and the polydispersity of the droplet distribution, the early-stage kinetics of a first-order phase transition remains difficult to explore. We investigate this issue by using laser-induced concentration variations to drive a transition locally in a liquid mixture with two intersecting pump beams whose interference pattern traps the nucleated droplets on the optical fringes. The time-resolved reflectivity of a third probe wave on the induced droplet grating allows us to characterize the droplet growth at its early stage, which illustrates the efficiency of transient grating methods in quantifying the kinetics of out-of-equilibrium processes. (C) 1998 Optical Society of America. [References: 16]
机译:由于大量的有核域和液滴分布的多分散性,一阶相变的早期动力学仍然难以探索。我们通过使用激光诱导的浓度变化来驱动具有两个相交的泵浦光束的液体混合物中的局部跃迁来研究此问题,该两个相交的泵浦光束的干涉图会捕获光学条纹上的成核液滴。感应液滴光栅上第三探测波在时间上的反射率使我们能够表征液滴的早期生长,这说明了瞬态光栅方法在量化失衡过程动力学方面的效率。 (C)1998年美国眼镜学会。 [参考:16]

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