散射诱导的多色高斯光束远场的光谱移动和光谱开关

Scattering-Induced Spectral Shifts and Spectral Switch of Polychromatic Gaussian Beams in Far Field

在静态散射的框架内,以高斯光束透过表面粗糙的绝缘板的远场谱强度为例,对散射诱导的光谱变化做了研究。前散射光的谱强度相对源光谱可能有红移和蓝移,某些条件下还会产生光谱开关。在影响散射光谱强度的诸参数中,板的厚度相对平均厚度的差值H参数起主要作用。当H=0时,归一化谱强度保持不变。散射诱导的多色高斯光束远场光谱开关属于"奇点光学"效应。

Within the framework of static scattering, scattering-induced spectral changes in the forward-scattered component of polychromatic Gaussian beams transmitting through an insulating plate with rough surface are discussed. It is shown that the spectrum may be red-shifted and blue-shifted in comparison with the source spectrum, and the spectral switch may also take place. The H-parameter (the maximum deviation of the surface profile from the mean surface line) influences spectral behavior greatly. The spectrum remains unchanged if H=0. The phenomenon of scattering-induced spectral switches of polychromatic Gaussian beams in the far zone belongs to the effect in singular optics.