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 (Friedlander F. G., Proc. R. Soc. A: Math. Phys. Sci., 186 (1946) 322). Velocity measurements are presented in 1D and 2D configurations and compared to the local speed of sound, to identify the supersonic region of the fluid. Our findings show an unprecedented control over hydrodynamic quantities in a paraxial fluid of light.

我们通过实验研究了弱相互作用光流体上的爆炸波动力学。流体密度和速度在 1D 和 2D 几何形状中测量。使用由近轴近似中的光学传播与流体动力学欧拉方程之间的类比产生的状态方程，我们可以访问流体静压和动压。在 2D 配置中，我们观察到局部超密度快速膨胀后的负静水压差，这是可压缩气体爆炸波的典型特征。我们的实验结果与 Friedlander 波形流体动力学模型进行了比较 ( Friedlander FG , Proc. R. Soc. A: Math. Phys. Sci. , 186(1946) 322)。速度测量以 1D 和 2D 配置呈现，并与本地声速进行比较，以识别流体的超音速区域。我们的研究结果显示了对近轴光流体中流体力学量的前所未有的控制。