并依据部分相干光的交叉光谱密度的傍轴传输方程，重新定义了普遍的部分相干光的传输因子。
The new definition of the beam propagation factor for partially coherent light is proposed through the propagation equations of the cross-spectral density.
又介绍部分相干光的传输因子的传统定义，指出其适用范围，并引出部分相干光通过硬边光阑后的传输因子公式。
The definitions and the applicability of beam propagation factors for both coherent light and partially coherent light are introduced in detail with examples of some familiar beams.
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