We observe and measure the nonequilibrium dynamics of optical vortices as a function of propagation distance through a nonlinear medium. The precession of a tilted-core vortex is quantified as is vortex core sharpening, where the infinite width of a linear core subsequently shrinks and approaches the healing length of this nonlinear optical fluid. Experiments are performed with a variable-length nonlinear medium: a nonlinear fluid in a tank with an output window on a translating tube. This provides control over the distance the light propagates in the fluid and allows for the measurement of the dynamics throughout the propagation range. Results are compared with the predictions of a computational simulator to find the equivalent dimensionless nonlinear coefficient.

中文翻译：

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非线性介质中非平衡涡旋传播动力学的测量

我们观察并测量光学涡旋的非平衡动力学作为通过非线性介质的传播距离的函数。倾斜核心涡旋的进动被量化为涡旋核心锐化，其中线性核心的无限宽度随后收缩并接近该非线性光学流体的愈合长度。实验使用可变长度的非线性介质进行：罐中的非线性流体，在平移管上有输出窗口。这提供了对光在流体中传播的距离的控制，并允许在整个传播范围内测量动力学。将结果与计算模拟器的预测进行比较，以找到等效的无量纲非线性系数。