Light Scattering Character Study For 532nm Laser On Metal Surface In The Shock State

In this dissertation, the background and the significance of measuring light scattering intensity distribution on a rough metal surface are stated. In order to find out the rule of light scattering intensity distribution on the rough tungsten surface, the theory and the experiments are extensively and deeply studied.In theory, according to classical Beckmann theory, this paper has constructed a theory model to calculate light scattering intensity distribution on rough metal surface. Using the model we simulate the light scattering intensity distribution on the tungsten surface when a 532nm laser beam incidents vertically and illustrate the light scattering intensity distribution of different correlation length. Then we bring forward a method to compute the reflectivity in the static state and shock state, In experiment, we have designed an experiment setup to measure space distribution of scattering light. Then we compare the conclusion of numerical simulation to the experimental conclusion and find the simulation result is almost consistent with the experiment result. Besides, we have also measured the scattering distribution on the tungsten surface whose roughness is 0.56+0.02um, when tungsten surface was shocked on the pressure of 82GPa, 110GPa and 138GPa. On the basis of experiment results, we provide the curve of light scattering distribution when a 532nm laser beam incidents vertically on the tungsten surface and the fitting curve of light scattering intensity ratio before and after the impactor shock the target, In addition, we have also calculated the reflectivity of tungsten surface before and after the impactor shock the target. Finally, by means of analyzing the fitting curves we have put forward several conclusions of light scattering character.