表面粗糙度对高斯光束通过各向异性平行板传输的影响
Surfaces roughness effects on the transmission of Gaussian beams by anisotropic parallel plates
摘要：
研究了精密椭偏实验中平板表面粗糙度的影响。考虑了高斯激光束穿过单轴薄片的实际情况。利用一阶微扰理论确定了透射率的表达式。在这个框架中，它示出了干涉发生在镜面透射光束和散射场之间。这种效应是由于高斯光束的角分布，并且在粗糙度与波长比中是一阶的。作为一个应用，数值模拟的石英粗糙表面的影响，在垂直入射。干涉项被发现是强烈连接到表面粗糙度的随机性质。
英文摘要：
Influence of the plate surfaces roughness in precise ellipsometry experiments is studied. The realistic case of a Gaussian laser beam crossing a uniaxial platelet is considered. Expression for the transmittance is determined using the first order perturbation theory. In this frame, it is shown that interference takes place between the specular transmitted beam and the scattered field. This effect is due to the angular distribution of the Gaussian beam and is of first order in the roughness over wavelength ratio. As an application, a numerical simulation of the effects of quartz roughness surfaces at normal incidence is provided. The interference term is found to be strongly connected to the random nature of the surface roughness.
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