多色空间相干光经过环形光阑衍射之后的光谱奇异现象

Spectral Anomalies of the Polychromatic,Spatially Coherent Light Diffracted by an Annular Aperture

研究了多色空间完全相干光经过环形光阑衍射后在远场出现的光谱变化,并给出了详细的数值计算结果和具体实例.研究表明,在艾里斑零点附近的光谱发生了显著的变化,即有些点光谱会发生红移,有些点会发生蓝移,而在另外一些地方单一谱线则分裂成两条谱线,这种光谱变化依赖于中心拦截比和衍射角.

The spectral behavior of polychromatic spatially fully coherent light diffracted by an annular aperture in the far field is studied. Detailed numerical calculation results are presented and illustrated. It is shown that the spectral changes take place in the vicinity of zeros of the Airy pattern, namely, the spectrum is red-shifted at some points, blue-shifted at others, and is split into two lines elsewhere, and this kind of spectral change depends on the central obstruction ratio and diffraction angle.