高斯-谢尔模型光束通过光阑像散透镜传输轴上光谱变化

从部分相干光的传输理论出发,研究了高斯-谢尔模型(GSM)光束通过光阑像散透镜传输轴上的光谱变化规律.结果表明,与光源光谱相比,高斯-谢尔模型(GSM)光束通过光阑像散透镜传输轴上光谱发生了中心频率的移动,这种现象被称为光谱位移.详细分析了透镜的像散、光束的空间相关性和光阑的截断参量对光谱变化的影响.数值计算表明,这些参量会对光谱移动产生比较大的作用.

On-Axis Spectral Changes of Gaussian Schell-Model Beams Passing Through an Astigmatic Aperture Lens

Based on the propagation law of partially coherent light, the spectral changes of Gaussian Schell-model (GSM) beams passing through an astigmatic aperture lens are studied. It is shown that as compared with the original spectrum of the source, the axial spectrum in the focused field shifts to lower or higher frequency, which is defined as a spectral shift. The dependence of spectral shift of GSM beams on the astigmatism of the lens, spatial coherence of GSM beams and the aperture diffraction is investigated in detail. The numerical results show that these parameters affect the spectral shift noticeably. A comparison with the aberration-free case is made, and shows that the astigmatism affects the spectral behavior of GSM beams, the larger astigmatism results in larger spectral changes in general.