硬边光阑对多色矢量光束光谱开关的影响

从偏振矩阵和交叉谱密度传输公式出发,分析了硬边光阑对多色矢量高斯-谢尔模型光束轴上光谱开关的影响。结果表明,插入偏振片前,光谱开关的光谱跃迁量Δ随截断参数δ的增加而减少,光谱极小值Smin和位置zc/z0随δ的增加而增大。插入偏振片后,光谱开关随δ的变化规律与插入偏振片前的变化规律相同。但偏振片的旋转角度θ会对出现光谱开关的δ的范围产生影响。

Influence of hard-edge aperture on the spectral switch of polychromatic vector beams

Starting from the polarization matrix and propagation equation of the cross-spectral density matrix,a detailed study of the influence of hard-edge aperture on the spectral switch of polychromatic vector Gaussian-Schell model beams is performed. It is shown that before inserting a polarizer the transition height △ of the spectral switch decreases,the minimum Smin,and the critical position zc/z0 increase as the truncation parameter δ increases. After inserting the polarizer,the spectral switch varies with the truncation parameter δ in a similar way as the case without the polarizer. However,the polarization angle θ affects the range of the truncation parameter δ at which the spectral switch appears.