傍轴光流体中的冲击波
Blast waves in a paraxial fluid of light
摘要：
我们在实验上研究了弱相互作用光流体上的冲击波动力学。流体密度和速度在1D和2D几何形状中测量。使用状态方程产生的光学传播的傍轴近似和流体动力学欧拉方程之间的类比，我们访问的流体静压和动压。在2D配置中，我们观察到一个负的流体静压差后，快速膨胀的局部过密度，这是一个典型的签名的冲击波的可压缩气体。我们的实验结果进行了比较Friedlander波形流体动力学模型。速度测量在1D和2D配置，并比较当地的声速，以确定超音速区域的流体。我们的研究结果表明，一个前所未有的控制流体动力学量的傍轴流体的光。
英文摘要：
We study experimentally blast wave dynamics on a weakly interacting fluid of light. The fluid density and velocity are measured in 1D and 2D geometries. Using a state equation arising from the analogy between optical propagation in the paraxial approximation and the hydrodynamic Euler's equation, we access the fluid hydrostatic and dynamic pressure. In the 2D configuration, we observe a negative differential hydrostatic pressure after the fast expansion of a localized over-density, which is a typical signature of a blast wave for compressible gases. Our experimental results are compared to the Friedlander waveform hydrodynamical model. Velocity measurements are presented in 1D and 2D configurations and compared to the local speed of sound, to identify supersonic region of the fluid. Our findings show an unprecedented control over hydrodynamic quantities in a paraxial fluid of light.
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