部分相干光经色差光学透镜聚焦的光谱变化

Spectral Changes Induced by Partially Coherent Light after Focusing through an Optical Lens with Chromatic Aberration

基于部分相干光的传输理论 ,研究部分相干光通过一光阑限制的色差光学透镜聚焦后 ,聚焦光场的光谱特性 .数值计算表明 ,适量的透镜色差就能使聚焦光场的光谱产生显著的变化 ,并且这种光谱变化还与入射光的空间相干度及光谱宽度有关 .入射光的空间相干度越小 ,色差所引起的光谱位移越小 ;入射光的光谱宽度越窄 。

Based on the propagation theory of partially coherent light, the authors investigate the spectral characteristics of the focused light field induced by partially coherent light after focusing through an apertune lens. Numerical calculation shows that a moderate chromatic aberration of lens gives rise to remarkable spectral changes in focused light field, and this spectral changes are dependent on the degree of spatial coherence of incident light and on the width of spectrum. The lower degree of spatial coherence of the incident light, the smaller spectral shifts induced by chromatic aberration; the narrower spectral width of incident light, the smaller spectral shifts induced by chromatic aberration.