部分相干光通过像散透镜的聚焦特性

Focusing properties of partially coherent light passing through an astigmatic lens

从部分相干光的传输理论出发 ,推导出高斯 谢尔模型 (GSM )光束表示的部分相干光通过像散透镜后光强分布的解析表示式 ,并进行了数值计算。研究结果表明 ,像散影响部分相干光的聚焦特性。与没有像散情况比较 ,像散使部分相干光轴上最大光强的位置移动 ,导致实际焦点的光强减小。

Starting from the propagation law of partially coherent light,an analytical equation of intensity distributions of partially coherent light expressed in terms of the Gaussian-Schell model (GSM) beam propagating through an astigmatic lens is derived,and numerical calculations are performed. It is shown that the astigmatism affects the focusing properties of partially coherent light.Compared with the stigmatic lens,the astigmatism gives rise to a shift of the position of on-axis maximum intensity,and reduces the intensity at the real focal point.